I'm a minor and ex posted nude photos of me on internet?

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I'm 15 years old. I dated a boy who had a lot of issues. He would threaten me into sending him photos, and would threaten me if I left him. I found out yesterday that he had cheated, and he, as usual, denied it. So I blocked his number so he couldn't threaten me anymore. He called me off another phone and told me to go look at Instagram where there were about 6 nude photos of me. It was only up for 30 seconds but I received multiple texts about it. I'm getting harassed on the internet also. My mother knows as she had to tell his parents to leave me alone. She thinks this is all my fault, and she's calling me names and taking away every thing I have. I don't want to go back to school as I already get picked on and its a very small school, so everyone knows about it. We live in a very small area and changing schools wouldn't fix anything, and my mother wouldn't let me. He is still texting me and begging me for forgiveness. My mom is messing with me to the point where I wish I wouldn't have told her.she will not let me contact police or anyone.I know sending them was wrong but it was never my choice, I feared him. What do I do?