My dear friend,
You are not alone. My step-brother was 3 years older than me and started wanting to play when I was 9 and just starting to enter puberty. At first I didnt want to do those things. I refused. But got into trouble for fighting. ( I wasnt about to tell my parents that I was fighting to keep him out of my bed) He nagged and pestered and forced the issue and I gave in.
Now you have to understand that I was going to a Catholic school, was very devout, and wouldnt even look at my privets because it was bad. The guilt was so overwhelming that I stopped going to confession and taking communion. But along with the guilt came the adolescent pleasure.
Yes, I learned to enjoy some of the things we did. Yes, occasionally I would ask him to come over to my bed and play. Yes, I felt shame and guilt for many years. And yes, I was abused.
I was molested by an older boy and taught thing that a child of my age had no business knowing about, let alone doing. I was ignored by parents who refused to see the signs of what was going on or protect me properly. And I was heaped with guilt by a church/school that was utterly insensitive to the mental anguish that its teachings caused.
When a child is forced either physically or emotionally into sexual behaviors that are beyond his understanding, that is abuse. Coupled with the guilt and shame it is a negatively life altering tragedy. Children do not consent to sex. They lack the comprehension, maturity, and legal standing to consent.
What ever happened, however much you may have come to enjoy some of the physical pleasures, it was still abuse. An older, more sexually sophisticated person, (even if that person is himself a minor) who elicits sexual behavior from a child, commits rape.
You may never get rid of all the feeling of guilt, and that is part of the evil of CSA. It isnt so much the sex that hurt us. It is the life long confusion that causes the most pain.
So no, you are not alone. And you are not guilty. You were abused.
Aden