[sertraline]

I'm not 100% sure what I'm asking here but recently I remembered an incident from when I was younger that I had forgotten for several years. It's nothing major at all but I keep thinking about it and I don't know why, I don't feel sad or angry or anything.
I was about 8 and being looked after by my nan along with my sister and two male cousins. Myself, my sister and cousins were in the park and my cousins encouraged my sister to return to my nan's house, told her we'd be climbing trees and she's afraid of heights. When she left, they took me into a little enclave in the woods and pressured me to practice making out with them both. The eldest was about 13, the other 10.
I feel ashamed posting here because it's probably nothing really, just children being curious? I've had a few dreams recently about being abused, they're not nightmares but I wake up feeling gross and upset.
I've been diagnosed with dysthymia and anxiety. In the past I've suffered from Anorexia and Bulimia. I also compulsively pull hair and skin though I've never disclosed that.
Does it sound like there might be underlying abuse? Perhaps that I'm only starting to remember? Or is it possible that that one minor incident has had quite an effect on me?
Thanks for any contribution