Don’t decide until you start classes and see how they go. The beauty of college is that you can make it what you want. Study hard, get a good GPA, and graduate and get a good job.
Too much focus is on having fun and growing up in college. That will happen, but you don’t need to force it.
And if you feel this way in two weeks, many colleges offer free counseling. It’s good to know they have support foot students who have a tough time, for whatever reason.