Reading this thread has made me realize that I'm not alone in the "getting too attached too fast" issue, among other things. I thank the op for that, it's a mildly comforting realization.

I've been in your situation before, despite being only 17 I have had a continuous failed history with relationships. I would meet a girl, talk for a week or two with her and then boom - I'd be wanting more. Not in a "I love you after 2 weeks" way, but I have always found it hard to separate myself after I find someone who I see potential with. It's bit me in the *** many times (5 to date). I end up pushing these girls away because I came on too strong, too soon. The longest I've ever had a relationship was for a year and a half, and that ended after she cheated on me. Poor history for a young guy.

I also seriously relate to your situation of falling for someone of a different age - though my scenario is in reverse, and nowhere near as large of a gap (the girl I love is 23, 6.5 years older than I am). I will say, perhaps naively, that (even though things didn't work out for you with her) at least you have the freedom to pursue a relationship with WHOEVER you want to, for good or bad, and there are many people out there who you have yet to meet. I'm not so lucky - I've fallen head over heels for the girl I so desperately want to be with, and my parents will NOT let me be with her. I love her and they have banned almost all contact with this girl because of the age gap and their "preconceived" ideas of her (if you want more info on that and a sad story to read, check my thread on it). I guess I'm trying to say in a roundabout way that you've got so many options and opportunities before you, and that you can't let yourself get down too low. You're going to find SOMEONE who will suit you, but it may not be tomorrow. Chances are you'll stumble upon her when you aren't even looking, like I did with my girl.

Hope that makes sense and maybe helps a bit.