Without further context, I would accept both of them.
Student or Learner
I had wanted to become a teacher.
I wanted to become a teacher.
Which one is grammatically correct?
As far as I know we use past perfect for unrealized dreams.
Thanks for help.
In a straightforward talking about past situations, including wants, we use the past simple. If we are talking about past dreams in relation to a later past event, we use the past perfect.
If you have given up on the dream of becoming a teacher then how would you describe it?
I used to want to be a teacher.