You're putting way too much thought into this. Just let it flow.

I remember a few months ago when College was about to start, I started to worry about skipping classes, missing important notes, long essays, etc.

When the big day did arrive and I started college, it was nothing that I expected. Believe me, almost everybody, if not everybody is in the same situation as yourself. Just be relaxed and absorb the college life the first few days, you should be fine.