A masturbator said:

When I was 13 I used to spend a lot of my weekend time with a much
older guy having lots of wanking fun together. It was like I existed
in 2 different worlds. There was my normal schoolboy life during the
week and then my very exciting and very different sexual life on
weekends. The 2 were so different from each other that it’s near
impossible to relate them timewise. I remember sitting in the back of
the classroom looking around at all my classmates and wondering how
they would react if they discovered what I got up to on weekends.
I don’t recall feeling shame though. Jacking off with another guy,
particularly an adult, was too much of a new exciting thrill to care
what anyone thought.