First of all I am not English so my writing is not great but this is what happened , i was born in a mid class family which seemed 'normal'at the time but it was clearly a dysfunctional family , abusive mother and father got schizophrenia when I was about 11 or 12.
I abused my sister aproximately at the time when our dad got his first psychotic episode ( he thought he was an undercover spy and people were on to get us

) I don't know when exactly it happened but I remember being home together with her for many hours as our parents were working late shifts , in one of those days we found in a hidden box a bunch of porn magazines and we decided to try it out ...I was about 11-12 and my sister is 3 years younger than me , and we didn't have sex but we got naked and I used to rub it between her legs and it was also the first time when I ejaculated , it went on and off for a few months till our mom found us naked and went into a rage we were grounded for a few days and after I was grounded for a few weeks while my sister regained her position in the family I also remember kissing my baby cousin which was like 7

I ###$ up so bad.... , dad was in hospital at this point for his mental illness .
Soon after mum divorced dad as he was not taking his meds and she was tired of the beatings and her hatred towards me intensified treating me the same way she used to treat my sick dad , our relationship degraded to a point where I was forced to leave the house and start a new life somewhere , I am now in good relations with her and my sister but I did drugs for some years and got severe anxiety because of it and now I came out to my mom and sister about the abuse of my sister ( they pretended like it never happened ) and they were supporting of me as I am batlling mental illness just like my father . I feel suicidal about the stuff I did to my sister and every day seems like a burden which is too heavy to carry