I only have one question How will God see this...
God has seen all that has happened to you; without any doubt he knows that none of it was your fault. You don't say so in so many words, but I wonder if you are wondering about the abuse you endured when you were older, like 16-17. Are you asking yourself, "Why didn't I stop it? By then I was old enough to take care of myself."
Our community has a lot of guys in it who were abused at older ages - I hit rock bottom when I was 20, for example. I think the thing to remember here is that there is no age when a young person suddenly stops being vulnerable. Adult predators know exactly how to groom their victims and set them at ease before the trap is sprung.
In your case, as in mine and many others, there is also the point that when a young boy is abused it wrecks him emotionally and sweeps away all his boundaries. I was first abused at the age of 10, and by 12 I clearly recall feeling totally worthless. No wonder I was ready to commit suicide by then.
Look back at Young Gary, not the 17-year-old but the 13-year-old. Think back to how his feelings about himself were gradually distorted and his self-respect eroded. It's not surprising that you succumbed to the fact that the sex felt good; you were a broken boy, growing up and becoming more nature, but still that broken boy.
And going back time after time. That's my story and the story of so many other guys here as well. But if you look back not to the things that happened, but to your feelings as a teenager, you will probably see all the signs of that broken boy again. The numbing out, the feeling of "what does it matter", thinking "this is all I'm good for", etc.
All of that was part of the impact that abuse had on you. And no, none of it was your fault.