Don't worry about how old you feel in school, a recent studies show that the percent of older people go to school has increase dramatically. I see moms/dads/ grandmas, and grandpas in my class all the time. They actually studies harder and get better grades then most of the younger student.
Good for you that you going to college, you will have something to fall back on encase something happen. Even if you don't like college at least you know you tried it, and it wasn't for you.