Your letter is not at all inappropriate. It is very concerning. But assigning blame is not going to be helpful. From my point of view, neither of you were “at fault.” Yes, you were “abused” in that an older person (in this case age 7) was being sexual with you without your “consent.” But a 7-year-old generally doesn’t know anything about stimulating another person sexually. And a 4-year-old will generally follow the lead of an older kid.
Both of you were confused and upset. It is highly likely the boy was doing what children do when they are trying to process trauma. He may have been acting out something that was happening to him that he didn’t understand but knew wasn’t right. You probably couldn’t make sense of the situation either but knew that hiding something made it bad. My heart goes out to both of those two confused little kids.
You mention other experiences that affected you including continual emotional abuse. I’m concerned that the result is a damaged self-esteem that is at the root of your emotional and social problems today. I’m very glad you decided to write. You know you are in emotional distress. But you aren’t getting the help you need. Perhaps the same low self-esteem makes you think you don’t deserve it. You do.
You have a long life ahead of you. At 19, you are now old enough to find the help you need without asking permission and without involving the people who emotionally abused you. Make an appointment with a mental health counselor who can give you the ongoing support and guidance you need to claim the sense of self-worth that is waiting to be freed.
I wish you well.