"Used to" means it was a repeated habit or condition of the past. That is what you want in your sentence.
"Was used to" means that you were comfortable with/familiar with/accustomed to something. You "get used to something" in the process of achieving this comfort/familiarity.
It is hard to have a roommate because I was used to living alone.
I love having a roommate. I used to live alone but I never could get used to how quiet it was all the time.
Student or Learner