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A lot of the time, your worries will revolve around whether or not you can successfully do something. Despite some things being largely up to the winds of chance (as mentioned above), you can compensate nicely by undertaking other endeavors on your own. Pick anything you've always wanted to do, want to do better, or want to start doing again, and give it a shot.  Remember, there's nothing to lose from trying something for your own enjoyment. Therefore, there's no good reason to worry about how well you'll do. Just compete against yourself and do your best not to worry what others might think. Keep trying and working on things that interest you. You'll succeed more often than you might think, and begin to worry a lot less as you realize that 75% of success is just getting out there and trying. People who seem successful and happy are people just like you, except that they never let their worries stop them from giving things another shot. The things you try don't have to be flashy, or significant to anyone except you. You could take up a new hobby, such as knitting or martial arts, or you could just make a commitment to smile more often at work. The goals you set are yours to attempt and achieve. Pursue anything you've ever wanted to pursue. You'll be delighted with the results more often than not. Don't obsess about the future; instead, focus on living in the present. It's fine to plan ahead sensibly and set goals, but the important thing is living your life as it is now, and not worry about what is already past or what the distant future might hold.  Practice self-acceptance. As mentioned previously, excessive self-criticism is a major source of worry. A part of us listens to what we say about ourselves, whether we want it to or not. If you're always down on yourself, you won't be able to enjoy anything. Telling yourself you'll do better in the future is one thing; refusing to feel proud of yourself and happy with the steps you've taken to make your life enjoyable right now is a different beast.  Remember that people are essentially self-centered. When you make an embarrassing mistake or scene, it can cause all your worries to spring back to life with a vengeance, making you half-catatonic with fear and self-doubt. The fact is, everybody has such gaffes now and again, and most people aside from the person who slipped up either forget about it completely or disregard it soon thereafter. Nobody is obsessively watching your every move; in fact, most people won't even remember what you said to them a month ago unless you say it to them again. There's no reason to carry the shame and embarrassment with you after the fact. Like most old adages and proverbs, this one gets repeated ad infinitum because it's actually very wise advice. Set aside your resistance to clichés for a moment and think about all the advantages you have. You're reading this article on the Internet, which means you either have or can borrow Internet access. It also means you can read, which is something not everybody can do. All but the most hopeless and pitiable lives have an abundance of good in them. Find yours, and remind yourself to be grateful for it every day.  Put your life in context. If you live in a building with a roof and walls, be grateful for that instead of worrying that it's too humble or too run-down. If you don't have a home, be grateful for the clothes on your back. If you live somewhere with harsh weather, be grateful that it sometimes passes and becomes pleasant. Be grateful that you can think for yourself, comprehend beauty, and dream of better things. No matter your situation, if you're reading this article, you can find things to appreciate about your life. Think of them whenever you find yourself sitting and worrying instead of acting and enjoying life. There are some people who worry because they are trying to take care of everyone and everything around them, or because they read about problems elsewhere in the world and feel as though they are never doing enough to help. It's good to be supportive and charitable, but taking it too far will turn you into a used-up mess of nerves and frustration. Make a conscious effort to remind yourself that other people, like you, are more capable than they realize, and that you don't always need to be there for everyone at every turn.  People who have everything taken care of for them, such as coddled children, end up ill-equipped to function in the adult world, which means that sometimes not helping is actually the best help you can give. It's also important to remind yourself that others care just as much as you do about social issues and charitable causes. It's okay to let them share the burden of responsibility; often it's the only way to make it bearable. This doesn't mean you should stop caring; rather, it means you should take pride in what you do and stop worrying that it isn't good enough. It is. Set a limit for yourself. This could be a limit to the amount of time you spend helping others, a limit to the money you spend to support them, or just a limit to how much time you spend worrying about the world's problems. Design a limit based around the type of caring you engage in that causes your worry. Remember that worrying never fixed anything, and there are some things you can't fix no matter how badly you might want to. Force yourself to set your worries aside past a certain point, and do whatever you have to do to enforce that limit. At the end of the day, there are some things that nobody can really control: weather, death, natural disasters, and other such unstoppable forces are a part of life on Earth. Learn to place faith in your own ability to handle them. You can't change the way such things behave, so all you can really do is to prepare for them, and to trust in yourself to do what you can when faced with them.  For example, thousands of people get into car accidents every year, but people continue to use cars because they trust themselves to do everything they can to avoid such an eventuality: driving safely, wearing seatbelts, learning from past mistakes, and responding quickly to changes on the road ahead of them. Take the same attitude with every uncontrollable force in your life. It's sensible to prepare for misfortune. Things like emergency food and water, first-aid kits, and fire extinguishers are wise investments in your continued safety. However, be sure when you prepare that your preparations are easing your worries rather than fueling them. Don't give in to urges to buy and prepare more and more. The goal is to find a reasonable balance, say "this is enough," and get on with your daily life.
Take a plunge. Live in the moment. Count your blessings. Limit your responsibilities. Trust yourself.