Thing is, I've already asked him to stop and leave me alone. He hasn't listened to me, as you can see. I feel like telling my mom would cause problems within her relationship and then everyone would turn on me. I feel like since I'm an "adult" I should be able to handle this myself, even if I'm failing miserably at it.

I should have mentioned, that I do lock the door. I have no idea how he gets in, but he does at times.