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I think it's natural to get cold feet for anything THIS huge, but that doesn't mean you should ignore your feelings, either. I see you've already been accepted to a bunch of schools...if you don't go now, you probably won't get in again, so this is really it for you. Maybe you could try to come up with a good reason and defer admission for a year? See how you enjoy a gap year and if you still feel the same way by the end?
One thing to keep in mind is that we all exaggerate. I'm in med school now and I do not study all day every day. Certainly more than in undergrad, but I still have time for my hobbies. If you keep yourself on a good schedule and don't waste your time doing things you don't need to be doing, then you'll be able to find time for the things you love to do.