Starting to regret being a mom.

I'm 21 years old, live with my parents (please don't judge, although I know some of you will anyway), I work a full time job, and have weekends off. My mother watches my son every day when I work, and when I'm off on the weekends she refuses to watch him if a friend wants to hangout with me. I've made plans to go to the bar (first time ever) one weekend, and said she wouldn't watch him LAST MINUTE. So I had to cancel on all of my friends. 
I'm starting to become depressed. I love my son but Jesus. I'm more angry at her. Am I ever going to live my life? I never get a mommy break. Ever. My mom calls the weekend her "days off" 
Someone give me some insight. Or positivity. Idk :(