When i was little a kid sucked my wiener?

i was a bout 7 8 or 9 somewhere around there haha but any how i ran into my dads sex tape collection and put it in the vcr and thought that it was normal and this mentally handycaped kid next door he was 17 at the time he was kind of there and kind of not i showed him the tape and he sucked me off and he was a fat kid and i told him we cant tell anyone we would get in trouble lol but honestly it was my idea cause i thought it was normal and i didint see the fun in it lol but i have never still told my mom or anything i am 19 and i have 2 beautiful daughters with my gf soon to be wife just a question how come it has never botherd me?