I think my stepdad is molesting me and I have no idea who to turn to. Advice please?

I am 14 years old. I live with my mom and stepdad. He's never actually raped me but he's done things like touch my butt. One night I was laying in bed just staring at the wall and I heard him come into my room. I thought he was just checking on me so I didn't really pay it much attention. Mind you, my back was face towards the door. So I'm just laying there and I feel him sit by my bed and he just puts his hand under my blanket and runs the tips of his fingers across my butt. I start moving around pretending to still be asleep, just trying to get comfortable. He then quickly moves his hand but stays frozen for a bit (I guess to make sure I was still "asleep"). Then, he gets up and leaves. Another day, I was in my room at night. I got a text from him asking if I wanted to watch a movie with him. I said "sure" because I thought my mom would be there too. When I went his room, I asked where my mom was and he said that she would be right back. I just said "okay" and sat on the floor. He laughed and told me I could sit on the bed. I sat on the side far away from him and he pulled me by my waist over to him and just left his hand there. I pretended that I had to use the bathroom and told him that I was tired and wanted to go to sleep. I don't know who I should speak to. I am SO scared to tell my mom. I don't want her to think that I'm lying and want to sabotage her relationship with him. I am scared of the police. I don't know who to talk to. I really don't. There have been more instances but I don't think I can fit them all.
I think my stepdad is molesting me and I have no idea who to turn to. Advice please?
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