I found college a lot more fun than high school. Most of the homework is reading (good if you like reading), there isn't as much 'busywork'. You have a lot more control over what you're doing, like you usually pick your own topic for papers you write. Also you'll see that in high school they teach you WHAT to think and in college it's HOW to think. You'll find it either more stimulating and interesting, or more impossible.
You should be looking forward with a sense of adventure. But i'm sure you know that. It's understandable to be anxious at first.
I wish I'd had a laptop in college, to take copious notes. They didn't have them then, but it would be a huge help.
If you do it right, you'l learn things in college that will enhance the whole rest of your life. And a lot of boring stuff too.
It's not that easy to get into college these days as it was in my day. So if you made it in, they must be pretty sure you'll do okay.