They didn't feel the same way about you as you felt about them. There's never really a specific reason. You can't expect someone to force emotions just to not hurt your feelings, but I understand the frustration. This is coming from someone who's been on both sides of the fence (weirdly enough I've rejected more people than people that have rejected me, but that's due to the fact that I'm a coward). It's probably not because of how you look, or your interests or whatever, they just don't feel 'that' way, and it can't be helped. People can't control how they feel, else no one would ever be heartbroken.
EDIT:
EDIT:
This guy said it better.manic_depressive13 said:I can see why you would want an explanation if someone you were in a relationship with broke up with you, because that means they liked you initially but something changed. If you're rejected when you first ask someone out you're not really entitled to an explanation and asking for one is weird. They're just not interested in you. They're not obliged to accept every offer that comes their way. I'm sure you look fine and are perfectly nice. However, people want more than that if they're going to enter a relationship with someone. To explain it in the most unhelpful way possible, you can like someone well enough, but unless you "click" in some way, like having very similar interests, sense of humour or at least mutual physical attraction, you probably wouldn't go out with them. Assuming you're not incredibly insecure and looking for validation by accepting anyone who shows interest.
Who knows, if you keep trying you might get lucky and stumble across a poor girl with serious self esteem issues. Otherwise, you can just stop actively seeking a relationship and wait until you meet someone you could genuinely see yourself spending time with. I mean, nine people in five years? In five years I'm unlikely to meet nine people I can tolerate, let alone that I would be willing to date. I'm inclined to think your eagerness to enter a relationship is clouding your judgement when it comes to real compatibility with the girls you're asking out.