How do I regain control of myself after these guys are talking to me?

Your in school so you know what happens if you start hanging out with guys alone in their room and the reputation you'll get. So maybe subconsiously you are prude which is a great thing. You want to be hard to get not easy. Your body naturally bottles up because that's not you. You aren't the girl who wants to be all the guys rooms. You need to take that feeling and redirect it. Not so much as closing up and not talking but make it into a different type of defense mechanism. Like the hard to get girl. Smile at people but when they ask you out tell them your not interested in hanging out but you don't mind being friends. I think you'll feel more in control at that point and feel better about yourself as you learn to adjust to these new feelings. Honestly, I really think that's the problem is that your getting all this attention very quickly and your psychi is screaming, "I'm not that kind of girl" so it's reacting by closing back up.