What do you do when you feel like you don't belong?

I never felt like I belonged anywhere. I always feel so out of place. It's getting to the point where I just don't care anymore. It's like this: I can succeed in pretty much anything I put my mind to. Anything tangible that is. But when it comes to human relations, I suck. I suck so bad. and now I am just angry and tired of feeling misunderstood. I am 22 years old for crying out loud. I don't get it. I don't even know what to do at this point. I just can't seem to form deep relationship with people and for that reason, they tend not to last either that or they become resentful towards me. Why I am so odd?