It's incredibly risky (and ill-advised) to explicitly state to a therapist that you are a pedo, that you are pedophile, that you are sexually aroused by underage girls as a fantasy or in real life, that you have or show a romantic interest towards underage girls, that you feel any of those things towards any specific persons you are in contact with (especially this, especially if it was close contact), or to suggest an underage person you are in contact with has or shows a romantic or sexual interest in you, and, of course, to disclose any information about an actual romantic, sexual, or even flirtatious relationship that occurred between you and an underage person, even if there were no criminal acts and of course if there were criminal acts but it wasn't abusive (which is a significantly ignored portion and perhaps even majority). (With a few obvious exceptions.)

Pretty much any professional in America can break confidentiality agreements whenever they believe they have reason to suspect there's child abuse; certain ones including therapists are required to by law. Depending on jurisdiction, I'm not 100% sure - some may be better. It also has improved over time in some places thanks to activism. But the point is: no, it is not generally safe - and let alone useful - in the vast majority of cases, at least in the western world. When it comes down to it, it really, really depends on the individual sitting in the chair opposite, and you are effectively (any time you admit, on record, to anything in the first paragraph) setting yourself up for... many more negative consequences than worth listing to you.

~ Balto