The closest thing I have to a childhood friend that would ever be remotely interested in me is a pansexual omniphile that I've known since 5th grade. Naturally, it's really just part of his personality to try and hit on everything that moves. He was always in a relationship and I always just viewed him as one of the guys and I don't swing that way, (plus I have like no sex drive) so nothing will probably ever becomes of that. (He's also FtM if that clears anything up)
But yeah, so far I only ever fell for a girl once and that didn't end well. And that was Freshman year of High School. I'm too asocial and, unlike in manga, that does not actually get people to pine after you.