Is this sexual assault…?

Keep in mind that I am currently 16 (17 in feb)

When I was as young as 7 years old, my cousin was 8 (both of us female. From what I remember, this all stopped when I was maybe 9 or so…) She used to peer pressure me into masturbating with her and making out with her. As crazy as this sounds, we were literally young children, and she would force me to do these things with her, and she said that if I didn’t, she would tell and say I was trying to do stuff to her. I’ve never told anybody this. It worries me as to why SHE would do that also, but I have trauma from it.

I also was harassed by an ex while we were dating last year, constantly pressuring me for nudes and only wanting sex when I didn’t want to give myself away. I didn’t put out and he left (thank god). He still tries to verbally harass me though, and I have taken steps to stop him.

Do these things count as assault or anything like that…?