My childhood therapist didn't fix me and I feel resentment towards them.
Don't think like that, therapists can only guide you, not fix you.
It's my right to resent him
Do you feel like you followed all of their recommendations and tried hard to change?
I'm not the kind of person who always does things others tell me to do.
A therapist can only help us so much, by helping us get thoughts out and guide the way we can move forward but its up to us to use the information to try and help ourselves.  You can get better if you keep trying but you shouldn't blame your therapist, perhaps you simply need a different one?