ADVICE ON LOVE PLEASE, ooh woe is me type stuff??

So I'm a senior in high school in 5 AP classes and weight training. Basically my problem is I've caught off all my loose ends with every girl I either liked or tried to like, it failed miserably. I was rejected multiple times, when they said "oh I'm sorry" after rejecting me I'd laugh it off like I did it out of curiosity and I didn't really care. (I did do it out of curiosity). But now I have no one, they all friend zoned me or just hate me now that they don't want to talk to me anymore. I don't understand why I can't find anyone. My personality is nerdy but I'm actually a gentlemen, polite, I'm very nice never mean unless it's friendly banter. My physique, I'm 6'2" 195lbs and I'm a weight trainer so it's kinda muscle mostly. I'm also a "genius" to what my friends tell me. I want to know if anyone can tell me why I can't find someone, I'm very self conscious and not confident. Will I ever find someone? Any advice? I feel despair and all hope lost. Please help, thank you.