Waiting for My Time to Shine

Well, I got a question..Do you guyz ever feel like ur an alien from another planet and that u JUST dont fit in wid the rest of the world?? I know it sounds insane, but that's exactly how I feel right now : Like an outsider. I sometimes think that there's a glitch in my brain..and that makes me anxious of myself. I think a hundred times before doing anything, and yet once itz done I keep thinking of the 101 ways I cud've done it better :/ 
I keep on waiting to find something I'm gud at doing, but it turns I have no talents at all (apart from being able to write down my feelings for hours! ^^)..I have no artistic skills, I can't sing or dance, I'm not athletic..I'm just SO boring and plain, ain't I?? And I feel like it's so unfair..somepeople has got it all..the looks and the brains, whereas I'm DUMB and PLAIN..
And the wierdest thing is, I'm writing all of this down right now and the next moment I'd be thinking "what the hell"! It's like I don't have any power over my own opinions either. >.< My thought process is like a constantly changing kaleidoscope, only it's not SO bright. 
I see something I don't approve of and I just can't shut my mouth until I say it out loud. And I have this totally compulsive disorder to be ALWAYS right.. and I sometimes have a  pathological need to be right and that leads to arguments with my friends. They judge me as rude, selfish and posessive but I wish they would look past those flaws and look on the brighter side. Now everyone has a brighter side, don't they?
 I just wish I could figure out mine, and find my niche in this world.