how can i get over getting disgusted every time i hear my parents having sex?

[Jen]

im 15 years old and i try to be as mature as possible about this situation as i can possibly be. But hearing them gets me very mad and annoyed. i feel they dont care im awake, like hello its 11 o'clock. i already confronted my mom and the next day i walk in on them by accident. she told me its not her fault ' what am i supposed to go to a hotel?' every time i think about this i feel like crying. this really messed me up i think. and now when im up at night doing homework or what ever i get paranoid and feel like any sound that is made its them. the next morning after i hear them im very frustrated and i keep hearing it over and over in my head. i know they love eachother and its good but still i want to pretend like it doesnt bother me but it does. i dont know how to get over this can some one please help?