You sound very much like me as well. Except you go a little bit further and do 'research'. Apart from that it's cock on what I'm like. Hoping to accidentaly bump into someone isn't a terrible thing in my opinion, because what's a world without hope? Having had a few heartaches though, it's just too much pain. It comes from having no-one, to suddenly someone likes you, one way or another, and it's such a good feeling. 'Finally, someone likes me!' Only they like you as a friend. Eventually you'll find someone. As has been said before, be yourself, and try not to get so attached so quickly. It's really hard, but it's ultimately worth it. For example, I liked a girl, started talking to her, texting, then for no reason she told me she didn't want to talk to me again '**** off you pathetic loser! Get a life!' I hadn't been especially friendly or nasty. Hadn't been obsessing with her, texting constantly or anything like that. Turns out her friends and her thought it would be really funny to play a joke, and pretend she hated me, when she actually fancied me :s But because I had expected her to do something like that, because she came across as being a bit immature, it didn't hurt nearly as much as anything in the past.
Play it cool. If you fancy someone, yeah go for it, but don't be too forward. Be confident, but not arrogant. Just chat to them and get to know them better before you start getting attached to them.
The violence thing comes from bottling things up, and not having any outlet. I get worried I might take things too far sometimes, and I have actually lashed out (not seriously), but that was when I was under a lot of stress, and I directed the anger at someone who was bullying me, so it's more appropriate. Although I don't condone violence in any way, shape or form, and for that I'm ashamed of myself...
All I'm saying is you're not alone. There are other people out there who feel like you do. I'd love to be in a relationship, but I'm not gunna go out with anyone for the sake of it. It gets me down sometimes, and sometimes it feels like 'Mr. X can get a girl and he's a complete *expletive* What the hell's wrong with me?'
The truth is, there's nothing wrong with me. Or you. Or anyone. We just need to find the right people. Some people just click, others don't. Some people will fancy you, others won't. It's just the way of the world... Just remember, you're not alone, and there's nothing wrong with you. You're just you. And that's the only person you should ever be...