How can I tell if I was abused as a baby/ at a very young age?

I am a woman, I am 21 years old and for many years I have felt that there is something strange about me in relation to the sexual aspect of my life.

For context, when I was about 9 year old I remember a night that we went on vacation and most of my family was up, I wanted to go to sleep bcs it was very late at night. I was supposed to sleep in a bedroom by myself but it was already occupied by some members of my family so I told my mom and she told me to go sleep with my dad. He was by himself in that bedroom and I went to bed next to him facing the wall. He woke up and basically cuddled me in that spoon position but he put his hand on my thigh underneath my underwear. I froze at that moment bcs I kinda knew that was not supposed to happen. After a few minutes he turned to the other side and went back to sleep as I left the room. I just went to the bathroom and cried. Never told anyone.

The thing about me is that I've always been sort of a trouble kid ig. I think I used to have a good relationship with my father when I was really young but as I grew up he started treating me differently, I would describe it as us becoming enemies, he would insult me and make fun of my looks and stuff like that. Im always very insecure and shy because growing up my mom's side of the family along with my mom, dad and brother made fun of my looks. Because of this I can't have a real connection with anyone, never had a boyfriend, only have one friend.

I remember being hypersexual since I was a kid and I even touched myself under the blanket next to my brother once when I was 7? Idek but I know I was really young and sort of remember how it happened. My brother called my mom and she said I was just messing around. The truth is idk why I did it.

Another thing that made me thus way, is something very serious and a sensitive topic that I never told anyone's about:

When I was 13 I remember my brother left his google account logged into the family computer and I was very noisy at the time so I checked his google pictures and found a picture of me naked. It was a picture that I sent to a girl that was hitting on me through Facebook, the only thing you could see in the picture was my legs and my vagina, and a little bit of the background which was my bedroom. I immediately recognized the picture and was shocked so bad I started crying the second I saw it. My brother is 4 years older than me and I don't know how he got that picture. I took it from my mom's old phone but I know I deleted it after I took it. I also never told anyone this. He still thinks I don't know and I hate him so much, even more than my father.

Apart from these experiences, I think there are physical "clues" about my suspicions: for some reason I had very serious urinary issues even before I got in first grade, I remember this because I had to let my teachers know of this. I also used to wet the bed until 12 years old (never knew why), and was so embarrassed about it, I sometimes do it still. And the one that makes me more suspicious is that idk why but even when I'm not in my period I always bleed (red new blood), and it hurts so much. My period started when I was 9 and has always been painful, to the point I can't even walk if I don't take pain pills.

I'm still hypersexual and guess what: I'm into older men. To this day I still live with my parents but I don't EVER talk to my dad, don't even want to look at his face. Idk if he did abuse me or not. I do know he's always looking at women's asses whenever he's in public and is a porn addict and it disgusts me, everything about him does.

My brother doesn't live here anymore and it has been the biggest relief of my life. I hope I never see him again.

Anyways I would really appreciate some feedback, I've never told anyone about this and would love to know what other people think about this situation. How can I be certain that something did happen to be when I was a baby if I don't remember anything from that time period? How can I be sure? What do I do?