Struggling

Hi, it's my first time posting on this Reddit page but I just thought why not go for it? I've struggled with several thoughts and involuntary fantasies about various things that are considered taboo and wrong. I feel ashamed nearly every day and I can't bring myself to tell my psychologist about what is happening. I feel like I'll be judged and lose my trust in anyone who would know. I think it's a response to having been exposed to sexual materials when I was younger. I've lost two relationships partially because of my “needs” and I don't know what to do anymore.

Any advice is appreciated <3