How do I find out what's wrong with me?

So it's going to be a rather long post.

So I'm 19, and never had a girlfriend. It's probably because I didn't really care, until about this summer. There were a few girls who liked me.

I'm good-looking (I'm tall, athletic, nice face), some people tell me I'm really good-looking. I can easily talk with people and make them laugh. But for some reason I got rejected by every girl I liked.

On the other hand I asked out like 7 girls so far. So I'm 0-7. I think it's probably my personality, but how can I find out on what should I change?

How do I find out what's wrong with me?
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