It’s possible that you’re being a bit scrupulous, but the concern is a legitimate, and even a laudable one to have. Priest are actually trained to be careful about whose confessions they hear (on a regular basis). I’ll never forget the advice that one old bishop gave when I started formation, “Never hear a nun’s confession before you’re fifty, it’ll give you the willies for weeks!” Presume the holiness of your priests and the good judgement of the bishop in putting him in your parish. The bigger question, however, might be leading yourself into temptation by conjuring up images of the sin. There are some very beautiful and delicate ways of expressing sins of impurity without leading ohters into sin. Visit an elderly and orthodox priest, tell him of your concern and ask him to teach you some of the “gentler” ways of expressing your sorrow. Know of my prayers!