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Talk about your girlfriend as you would any other friend. This in itself that may lead them to figure it out.  This can also be a way to get them more comfortable with the idea of you hanging out with girls (if that is not something you have done much before) or having a girlfriend.  You can say something like this:  “My friend Jessica and I are going to the movies tonight…” “Oh, Jessica’s giving me a ride to the party. You know, she's Hugo's sister and plays field hockey.” “Jessica just gave me this new book. She’s always right about my taste. I totally love it so far.” This is best done earlier in the relationship. Mentioning later that you have been dating a girl for a few months--and they have never even heard her name--that will tend to be more surprising and possibly upsetting. You may have been doing this all along and not realize it. It is best to find an appropriate moment to tell your parents about your girlfriend in order to maximize your chance of getting get the most positive reaction. What this would be will depend on a lot of things, including your parent(s), your culture, what is going on in your family, and and so on.  Try to find a time when they are both free and relatively unstressed. However, with some parents that may be easier said than done.  You can decide whether you want to tell them both together, or if you should tell one parent who may have a better reaction first. If you think they will both have a similar reaction, then telling them at the same time may be easier. Try not to worry too much about getting things "exactly right". There may not (and probably will not) be a perfect time to announce your newly found status as a boyfriend. Go for a time and place that seems reasonable. It is your parent's responsibility to handle your news, not yours. Having your first girlfriend is a rite of passage as much as needing your first shave or getting a driver's license. These are things you are supposed to do, and if your parents do not handle it well, that is not your fault. It is their duty to receive the news and deal with it as a parent of a teenager or young adult. You dohave a duty to consider their feelings and communicate with them respectfully as a young person, but if you do that...you have done your part. If you really want to have the best possible conversation about your girlfriend, then you can’t go around spending all of your time with her and neglecting your studies, your chores, or your time with your family. Instead, you want to continue doing all of the things you excel at well, so your parents can’t say, “So that’s why you’ve been slacking off…” when you tell them you have a girlfriend.  You don’t want them to think your girlfriend is a negative influence on you before they meet her. In fact, if you’re doing even better in school than ever before, then this can make them think she’s having a positive impact on your life. Of course, it can be hard to focus on anything but your girlfriend, especially if you’ve never dated anyone before and are head over heels. Just remind yourself that it’s important to maintain a healthy balance in your life; your relationship will be all the better for it. If you want to be around your girlfriend 24/7, that may be a bit of too much, too soon. This is certainly a possibility, especially if you’ve been friends with the girl for a while, or if you’ve brought her up so many times in conversation that it’s impossible for your parents not to wonder what’s really going on. You should actually take comfort in this fact, if this is the case; this will make telling them your big news so much easier! If your parents have asked if you have a girlfriend, have given you a knowing smile when you mentioned your girlfriend’s name, or have even spoken about their dating experiences when they were your age, then there’s a good chance that they already do know the score. If you’re feeling uncertain about what to say to your parents, then your girlfriend may have some great advice to give you. She can support you and encourage you that the conversation won’t be as terrible or painful as you think, and she may even give you some pointers about how to tell them. In fact, she might have even told her own parents already and can assure you that everything will be just fine. Plus, your girlfriend probably wants your parents to know the truth so you don’t have to keep sneaking around anymore. She’ll help you feel better about your plan. One way to make good things happen is to envision success before the big day. Though it sounds corny, it can help you to close your eyes, imagine yourself telling your parents that you have a girlfriend, and then having them have a positive, or at least not a negative, reaction. This can help you feel more relaxed and confident as you make your plans to have your big talk. Also, keep in mind that, if you told your parents you had something important to tell them or wanted to have a talk with them, they may be imagining something far worse than you having a girlfriend! Chances are that they will walk away feeling relieved.
Drop hints; talk about her. Find the right time and place. Don’t drop your studies or your other interests for your girlfriend. Consider the fact that they may already know. Talk to your girlfriend about it. Envision a positive outcome.