Xenon,
I had this problem too. That you love a girl and she just wanna be friends, though that does not work for you... Anyway, low IQ does not matter, it is about how you are, your inner self. Anyway, if You're not confident with yourself, work on it! I did it too, it really worked for me. And for this case, I should abandon you're thoughts about her. I know, easier said than done. I'm still thinking of a way myself to forget her. But my point is, that this does not happen only to you. My friend got the same thing, it's just normal. Anyway from what you are telling you seem a nice person, that's what counts.

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Amor vincit Omnia