Don't be scared by it. When you get there, everyone you are starting with will be in the same situation as you. The uni/lecturers will make sure you are sorted. It's not as if they are just going to leave you behind. Before I went to uni, teachers were telling me it would be very difficult, but I still managed without too much trouble to begin with :P You will soon get into the routine and you will learn in first year what it takes to do the work. Uni seemed a lot more duanting to me than it actually turned out to be. I had fun when I was at there. Just don't get too worried by it all.