Childhood affecting my ability to move on with adult things in life

This is about sex. So my mom and her husband would have very performative sex. Not normal sounds you try to keep to yourself. Screaming, hitting the wall, the bed. I asked to switch rooms because the rest of the kids in the house were young enough not to really know, definitely be sleeping or just giggle. I was told to shut my mouth and not discuss these things and stay in a child’s place. To this day I cannot have a normal sexual encounter without my mom yelling and their noises popping into my head and then I get disgusted and just live through the encounter and don’t try again. It’s exhausting. I just want to be able to blend in with a normal people, maybe even date one. My therapist thinks they did it on purpose and wanted me to hear which is a terrible thing to think but I suppose it has to be true. I just wish I could get it out of my head.