Sex and guilt

Julia
Hi. I come from a very catholic family and I recently had sex for the second time with my boyfriend of 8 months. I'm 17 and I feel so guilty about it. I know if I tell my parents they won't ever trust me again. What should I do. I can't tell my therapist because I don't want to be judged as some slut. Same with confession. Oh yeah and my 95 year old uncle who is a priest is visiting us...