I have no clear memories and I feel a lot of guilt.

My story is a bit long. When I was 15 or 16, I was reminded of things that had happened when I was between 4 and 5. Two uncles abused me. My memories of this have never been clear, and now, many years later, everything has become more distant and confusing, and I've doubted myself and my story several times. There are other things that happened in my childhood that I do remember more clearly: when I was between 7 and 8, I saw my parents having sex next to me (that night I had slept with them in their bed). Some time later, the same thing happened again, but with my stepfather and my mother. Also, when I was between 7 and 8, I was looking through some CDs in the DVD library at home, trying to label them by genre or movie. One of the CDs was a pornographic film. As usual, I was alone at home, so I watched the whole thing. I don't remember if I masturbated. I know that from a very young age I rubbed myself with stuffed animals, dolls, and other objects, although without much awareness of what I was doing, but the fear of being seen was present. There's something that haunts me right now: when I was 6 or 7 years old, my cousin (a year older) and I played around imitating some positions from a Kama Sutra book she had at home. I also have faint memories of once, while we were bathing, rubbing our private parts together. I don't know if this happened out of mutual curiosity and because of the content of the book we'd been exposed to, or if I was the one who created the situation and persuaded her to do it, or if I manipulated her. I don't remember it happening, but I'm afraid it did. What if I imitated what my uncles did to me or what I saw in the content I was exposed to? I feel fear, guilt, and shame. Also, half a year ago, I remembered that when I was 10 years old and I carried my little sister (who was about a month old) on my lap, I felt a pleasurable stimulus in my intimate area from the contact. When this image came back to me (it wasn't clear either, like my other memories), I felt guilty, but it didn't escalate because I understood it was a physical reaction and nothing more. But then I couldn't stop thinking about it and I wondered if I had prolonged or intensified the contact, and I felt so much guilt, disgust, and shame. It was so strong that I had an episode of OCD, and I feel like I still haven't been able to get out of it, because now I'm flooded with doubts about what happened with my cousin.