So, what exactly is my issue?

So, I grew up alone. Never had friends, my family can't stand me, and girls have always treated me like anathema. Whenever I go anywhere, I may as well be invisible, even if I talk to people. I've had several dating profiles / ads up for close to five years now, and I've never been on so much as a date from any of them. Any friends I make on the internet disappear within a month or two.... What the hell is wrong with me?

I'm not mean, I'm not rude, I don't smell, I bathe and take care of myself, I'm told I'm not ugly... none of that. Yet, no one wants to be around me, not even my family, and any time I try talking to a girl, they just treat me like a monster or something, and try their best to get away from me. Never so much as been hugged by anyone.

22 years old now, half way to 23, and that's how things have always been, and still are. I just don't know why people avoid me like the plague.

So, what would make you treat someone like they don't exist? What would make someone so repulsive that you wouldn't want to hang out with them? And, as a girl, what would make you treat a guy like anathema?

And, yes, I know this isn't the best place to ask. But, seeing as I don't have friends or anything, I don't really have anyone else to ask. And, as far as girls go, it's not about sex, so don't even start that -- I'm asexual, and do not care about it one bit.