No these experiences do not make you dirty or shameful,Most people masterbate at sometime in their lives,With my children I made sure if they felt like touching their private parts,they weren't to do it in public it was only something they did when on their own,You were obviously never given this advice.As for playing make out with your peers if you were lonely and it made you feel part of the group that's probably why you did even though you didn't like it,this still should not make you feel dirty or shameful. Good Luck and don't feel so bad about yourself
I was sexually abused as a child and I had these very same problems. Their was a time when I felt dirty and worthless. I take anti-depressants now and I used to see a counseler for quite some time. I am not saying that its that answer I am just saying you should talk to somebody. I am here if you need somebody to relate to. Please don't feel ashamed it is not your fault you were only a child if theirs anything I learned through my sexual abuse experiences that it was not my fault then and it isnt my fault now. Please feel free to message me.