I don't want to have much of a relationship with my mom's side of the family
Is it because you are uncomfortable with your her side of the family?
Yes, they are so smothering. It's suffocating to me.
It is normal to want to be respected by a family.   You should try to have a relationship with them but sent boundaries, so that you do not hurt your mom with your actions.
What is there to respect?
I'm just saying, family is family and it's definitely worth trying to have healthy relationships with them. They will always be in your lives no matter what, and how would they feel if a member is being detached? You don't know if you find them to be wonderful people in the end!