Summarize:

Sometimes, sensitivity is a product of having people be especially harsh or mean to you, or abandoning you, in the past. Consider your childhood, teen years, and later experiences (if any).   Past experiences with rejection, judgment, and abandonment may make you especially sensitive to these things. People with overly critical parents or guardians may end up especially sensitive as a result (and may show signs of anxiety or depression). Untangling some of these feelings might help you understand why you feel this way. What are you afraid of? Why are you so afraid of it? Think about it. This can stir up intense emotions, including buried ones, so expect to take weeks, months, or years to work on this problem, with plenty of breaks if you get overwhelmed.  Talking to a counselor or therapist may help. People’s opinions and behaviors are just that. We become more susceptible to someone’s opinions if we are feeling doubtful and placing too much of our own self-worth on the opinions and actions of others. When you are confident in your abilities, another person’s rude behavior or negative opinion will be less likely to affect you. Feeling proud and confident in your own skills is more important than the passing opinions of others.   Write a list of your strengths and abilities to remember what your strong points are.   Make a list of things or moments that you’re proud of. Reward yourself for these good things. Think about the sorts of skills that you demonstrate during these moments. How can you do more of those things? This will help build your self-confidence. Contributing and helping others feels very rewarding and gives you a sense of purpose. This contributes greatly to feelings of self-confidence. Remind yourself of your benefits and contributions to others around you.  Consider volunteering your time at a hospital, school event, local humane society, or website like wikiHow. Having things to work towards give you a sense of self-worth and purpose. This includes things you’d like to improve on or advance in.  Next, take each goal and break it into smaller steps. How can you begin working towards that goal? What little thing could you do now? If you're especially sensitive to how people treat you and you often overreact, you might have a strong radar for rejection. You worry that you're doing something wrong if you pick up on any kind of displeasure, and you want to fix it. However, it is important to understand that just because someone isn't happy with you doesn't mean you've done something wrong. In many cases, it means that person isn't happy with themselves and expects you to fill in the blanks (which is impossible).  Consider playing rejection therapy to gently increase your tolerance of rejection. If you think that you respond too sensitively to other people’s comments, you might benefit from talking about things with a counselor. This person can help you identify issues that lend to your hypersensitivity. They can also suggest strategies for coping when you interact with negative people.  Sometimes, extreme sensitivity is a sign of a disorder such as C-PTSD.
Consider if anything in your life caused you to be more sensitive. Take time to think about why you feel and react this way. Write a list of your strengths. Remind yourself of how you help others. Write a list of goals. Remind yourself that you don't need anyone's approval. Try talking to a mental health counselor.