It's been a real struggle to decide what to do after high school, but I think I want to go to college
Sounds like a good plan. Do you expect to get good grades in college?
I'm not interested in grades. I like learning things
For whatever reason you have, having an education is good for you. It is good for your future and your life.
I hope college isn't a waste of my time
It won't be a waste of time. There is so much to learn in college that you're sure to gain a lot by attending.