New School + Girls. Need Advice Urgently?

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I'm 16, male and i'm joining a new school next week. I've never had a GF or even a kiss and I don't know why. I don't want to sound arrogant but apparently girls find me attractive and that I could even be a model. I'm not a douchebag and I try to help other people when I can. I'm not shy around girls but at the same time i'm certainly not a player. Again without sounding arrogant I am quite clever getting good grades in my GCSE's etc. I have no issues with asking a girl out but I never get the chance because either I don't like the girl who likes me or the girl I like doesn't quite know me well enough. Apparently at my old school loads of girls had crushes on me. I'm not great at reading signs of when a girl is attracted to me.

Basically how can I get a nice girlfriend at my new school i'm joining?

Please help, best answer gets 20 points.