<human>: This is kind of hard to talk about and explain, I don't want to get into much detail. I'm being truthful in what I say and I'm just looking for guidance.

When I was about 7 years old, my sister (12 at the time) for some reason introduced me to the concept of masturbation. I do not want to get into much detail about what happened because it really is disgusting and hurts to think about but after it happened my sister looked over to me and said "Let's not talk about this ever again."

At the time I didn't understand what we did was really wrong, but based on her reaction I felt incredibly guilty. I feel kind of victimized here and I have for 12 years. I haven't been able to tell anyone what happened to me until I confessed it to my current significant other who was really understanding. My sister and I never talked about it ever again and sometimes I wonder if she thinks about it or if she's completely forgotten it. I'd never dare to bring it up again unless I was going to kill myself shortly after, it's just not an option.

Is there some sort of personal closure I can find to this? My relationship with my sister is fine I guess, she's kind of daft and I can't say that I love her as a sister. I could easily eject her from my life and sometimes feel like doing so because I just want to stop thinking about that terrible night where I was violated and introduced to something I shouldn't have discovered for a few more years. What can I do?

Can you summarize the given text in a few sentences?
<bot>: Sister and I had a weird night where she showed me how to masturbate and other things. 12 years later I can't let go of it and can never bring it up with her. Looking for closure of some sort.