Is it normal to feel older than I actually am?

I think culture and environment have a lot to do with maturing… Also lifestyle is different in each country. I’m from Europe, and I’m 19 but I have been drinking since I was 14. I’ve also been traveling alone for a while. I do what I want, although I am not completely irresponsible and stupid. I’m just an edgy person, who knows what life can give. But, in my new school, (which is a christian school in america), I feel much older and wiser. I don’t want to be associated with them. When I meet people from college, or even people who graduated from college, I can get along so well. We have a lot to talk about and a lot in common. But, I don’t even want to go to school anymore because people are very immature and they don’t even know who they are. They haven’t yet found themselves… I don’t know what to do.

Is it normal to feel older than what I actually am? These people make me feel like a stranger, and it upsets me since I have to live in that community 24/7.