However, when I actually went away to college, I realized that I had made a mistake (and also that I wasn’t that great at drawing). I actually spent more time working on videos with my roommate, who was majoring in video production, than I did working on my own projects."
While I went to college, I realized that my decision was flawed (and also that I wasn't very good at drawing).  I spent more time collaborating on videos with my roommate, who was majoring in video production, than I did working on my own projects.