Two years ago, I was in your shoes. I'm 21 now. There are two things you must think about when making this decision:
1. Is the school you're going to a "CS School"?
2. Are you confident enough in your abilities to not get a degree?
If the answer to 1 is "No," then no. Don't even bother. Especially if their CS department is small. The stress of dealing with subpar professors, and unenthusiastic students who barely remember the difference between << and >> will kill your enthusiasm for programming. Don't do it to yourself.
2 is there because, honestly, you don't need college for anything but help. Classes, professors and classmates won't make you better or worse. But they can push you in a certain direction (as mentioned above). Classes on any subject are only helpful if you weren't going to study the subject on your own as intensively. Otherwise, the school system's one-size-fits-all process will just slow you down. So think about it: Summer just ended--what were you doing? If you, say, started studying a topic that'd be covered in a CS degree (Algorithms, Programming Languages, Object-Oriented Design Patterns), or worked on a big project (even if you didn't completely finish it), then you probably don't need to go to school--you've got the enthusiasm and the internet. If you watched Let's Plays and screwed around not getting much done, a degree program with mentors, and a community of kids who share the same interest, might help you stay focused. Only if the answer to 1 is "yes".
The BIG takeaway:
At this point in my university career, I see more clearly than ever that if you want to improve yourself you need three things above all: Motivation, a mentor, and a community. It's hard to become a great Computer Scientist/Programmer without detailed, catered feedback from someone who already is one. It's challenging to keep focused when every time a friend calls you up, it's to talk about games they're playing rather than coding. It's impossible to improve without having the desire within yourself to sit down alone in front of a computer and debug code you're sure should be working perfectly. For hours. You have to supply the Motivation. But if the school can't supply you the other two, then it's not worth 4 years of a life you'll only live once, and potentially thousands in debt--something that can ruin you. Don't make the common choice; make the smart choice.
Good luck, and have fun.