I am 16 and my mum got married to a guy couple years ago who isn’t my dad. Him and I aren’t really close but for about a while now he’s been doing stuff to me while I’m

Asleep and my mum isn’t around. He’s pulled my bra down and he always pulls my pants down and he thinks it’s a joke but its not. He’s flicked my boob and down there. A few times when I’m sleep I’m not a heavy sleeper so I tend to wake up quit easily but he comes in my room

With his dick out. he’ll lay next to me and put his dick on my ass and move my underwear around. He slaps my ass and when I post photos of me in a bikini at the beach he always says to me that’s a cute pic. He always say rude shit about my body when my mums around yet I’m skinny as. But when she’s not around he says nice shit. He also sometimes moves my underwear up so he looks at my ass. When my mum walks in to see where he is he quickly puts his dick away and gets up like he’s not doing shit. He’s walked in on me in the shower, in the toilet. Idk if it’s sexual assault or something but it’s been happening for a while but been getting worse but I’m scared to death he made us move away from my family so I have no one to go to or run to. Please someone tell me what to do

Update:

I talked to mum and she doesn’t believe me apparently it’s all my fault

And she’s really angry with me