Don't let people talk you into doing things you don't want to do, don't let go of your values just to make someone else like you, don't pretend to accept what someone does when you really don't think it's okay.
Also, when you play games like 'hard to get' that's not really being honest is it? Now I'm not saying that when you are crushing on somebody that you have to tell them everything, or even immediately tell them that you like them or anything; I'm just saying that when you play hard to get you might be playing it too well, and guys will think you aren't interested and move on.
And when you play other games, like trying to make someone jealous or whatever, it can cause resentment and make people not trust you, or move on from liking you. Don't try to play head games.
It's also hard to find that 'one' guy of your life in high school, because you will be changing so much in the next few years, someone who seems absolutely perfect for you right now can be all wrong for you next year, or even next week.
Just as a note though, I hope that you realize you do not need a guy to make you happy or worthwhile. Do things for yourself, look at the things you love about yourself and what makes you a valuable person, all on your own.
When looking for a boyfriend, get with someone who has the same values as you, who makes you feel good, and who you have a good time with. When it's time for you to find the right person you will. Don't rush it.