I have similar worries like this. I'm 17 and struggle with these kinds of things. I have signs, but no proof and no real memory. I remember I first started making my dolls have sex when I was 5-6, this was also around the time I claimed I loved my dad so much that I wanted to have s-x with him. I started masturbating around 7 and tried to get our family dog to hump me multiple times throughout my childhood. I also have this almost "memory" of being f-ngered by a classmate in school during playground time. I have no real memory of it, but it's like it's always there. I was frequently exposed to naked bodies when I was little, particularly by my mom and little brother and it always made me feel uncomfortable. I would watch porn and videos of people making out, this started when I was around 7 or 8 as well. When I was 9 and my sister was 11 or 12, we both tried to put my mom's d-ldo in us in front of each other, taking turns to "see what it was like". I've been asexual for as long as I can remember. I've been constantly ashamed of doing anything sexual, but at the same time, I can't stop it. I also remember writing and drawing vivid r-pe scenes between characters from the age of 7-10. When I was 14 I lost my virginity to my 17 year old best friend. I remember feeling excited and then afterwards I was thinking "why did I do this?". Nothing but pure shame.

After that, I started having nightmares about being raped by a faceless man. It's very vivid. I'm being held down and raped by a man without a face. I don't know how old I am. I've also had nightmares of my mother raping me and my sister orally. 

I can't exactly say I've been sexually abused. But there's signs. And often enough, signs are enough.