Financial talk

I am 15 and a couple of months ago my mom found out that I had sex with my boyfriend. Since then, she hasn't let me go anywhere by myself.. if i wanna go somewhere I always have to take my little sister. I try my hardest to gain her trust back and show her that I'm responsible.. but nothing works! I do everything around the house.. I clean every room in the house, including hers, I do the laundry, do the dishes, take out the trash, and a babysit my little sisters every day and don't ask for any money. After doing all that for her she's never satisfied! If I forget to do one thing she starts yelling at me and she says I'm adding time to my grounding. What else can I do to make her trust me? I need help!!