Is there something wrong with me?

I'm a 19 yr old male. In grade school I was really bubbly, and the class clown, in highschool I was super quiet and would basically just go to school n hardly talk in any of my classes. I played fball and would talk to people I knew, but I never really got too into the social scene/making my own friends/starting conversations/etc. Till my sophomore/junior summer. I was still the same as I was but I was more confident and I started standing up for myself(I was picked on a lot becuz I never did anything back.) I got a few good friends that summer and I still hang with them today. I have a tendency to ramble on and sometimes ill either say something completely ridiculous, or ill have to stop mid sentence and think about the word I'm looking for. I also have developed a slight studder every so often, and sometimes I can't get the word out. I am kind of paranoid that I'm sick or going crazy, but too stubborn to go to the doctor. Sometimes when I get really excited ill rant and yell obscenities(among close friends, not in a serious way). I am very sarcastic and alot of times ill answer someone with a smartass comment(in a very calm serious tone). I say inapropriate things sometimes. I worry about stuff all the time. I tend to analyze situations, people, how people act to things, etc. And I hate being in big crowds unless I'm wearing like a jacket, or long sleeve shirt. I'm worried somethings wrong? Add? Aspergers? Anxiety?