mom fantasy

im 23 years old and i cant stop thinking about my mom , she is 48 now. It started when i was 15 years old. My friends and i were looking for my dads porn one day after school. We found magazines and tapes and some pictures. The pictures where actually pics of my mom. She was posing semi and completely nude. we also found that one of the tapes was actaully a sex tape of my mom and a dad. i was shocked but my friends wanted to watch it all. They forced me to watch it too. she was so hot.

For years now ive been masturbating to this..

What happens in your head is entirely your business. And it's a fantasy, it's not hurting anyone. But having written that. Is this causing you problems in forming healthy relationships? Or interfering with life in some other way.