quit my annoying habits

I don’t know if anyone else does this, but I’ll think about stuff way too deeply, like I’ll concentrate on walking and then I wont be able to walk right (Or at least I’ll feel as if I’m not) or I think about the stuff I do that normally people don’t think about, like when your bored you don’t really say “Oh, I’m going to rest my head on my hand” you just do it. It’s annoying and it’s getting worse every day. I have to walk home from school almost every day (Senior year and I still look incredibly stupid!) and time to time I see some random bung-hole shout something at me from a car or something and it’ll annoy me for the rest of the week when it didn’t use to. Also, when I’m standing and talking to someone I (Once again, THINKING ABOUT IT) can’t decide where to place my arms – folded? hands in pockets? ARGH! It’s annoying and I want to kick myself.