If it helps I went to college as a mature student and had exactly the same feelings, everyone going to college will be the same as you. Its a big step but a good one.
Maybe go to the college before you start to get use to the buildings and lay out, maybe when term not on so less people about. The first week or so is usally induction as wel land you get to learn things with everyone else, and people do not mind you asking, I have got a lost in a lot of libraries over the years!
Also you would not have got on the course if the college did not think you could do it, remember that