Relationship Differences with Mom and MIL

My mother and I have always had a bit of a strained relationship. She is extremely religious (Mormon) and never seems to understand me. I am a lot like my Dad's side of the family. I have suffered from depression since elementary school and I'm a tom-boy. I never seemed to be what she wanted. She is also kind of manipulative and doesn't always realize how her words hurt.

On the other hand I have always had an amazing relationship with my MIL. She is also the same religion but not as stringent about the rules.

My husband and I were pregnant before we were married which is a no no in our religion. But we are extremely happy and we love our son.

Has anyone else had a similar situation? I feel bad that I have such a better relationship with my MIL but I feel like she understands me and doesn't judge me. HELP!?