some people with anxiety will feel guilty about things they did in there past. For example I thought I had HIV because I slept around before I finally met my fiancée. I thought I deserved to have HIV because I slept around before I met her and I felt guilty..... Crazy right??.... Anyways all boys develop differently, puberty is a weird transition for all boys, (and I'm assuming girls of course). Trust me most boys did something strange around the ages of 11-14. I certainly did and I know my friends also did. you need to forgive yourself for being a young curious boy going through a weird transition. You obviously didn't enjoy it, arent continuing acts like that, or some weirdo. You feel guilt, it's now time to forgive yourself and move on with life.
my 13 year old son is going through the same issues... getting sexual thoughts & isnt able to control them he gets angry & very tensed... he looks frighten whenever those thoughts come on... he was an active kind & productive kid. These past few weeks his been walking under a dark cloud sad & very quiet. What scares me is that he does not talk at school and he is such a smart kid. we have tried talking to him & it works for a bit & then he falls back into that funk of anxiety...he got a MRI brain scan and we are waiting on the results.