I highly, highly doubt it's just you Shezbut. Particularly if m'ing was tied with a negative memory, like that of the uncle.
Shezbut, I am about to offer a major bit of "easier said than done," but do hear me out. You must understand that at your age, with both the uncle and the Kindergartner, you were operating under the mindset of a young child, and you're now reflecting upon that mindset with that of an adult. The two are very rarely compatible, as the later sees the former as something that should've been able to operate with the same values and reasoning that the adult mindset operates off of. Of course, that's not the case. I don't think for a moment that you enjoyed your uncle's attentions, not at all. I think, as a young girl and faced with an awful situation imposed by an authority figure, you were scared, and didn't know what to do. That's perfectly understandable, and nothing at all to be ashamed of Shezbut. As far as the two boys go, children are naturally curious about their own sexuality and the sexuality of others. I wouldn't give what happened there any more thought beyond the explorations of a child. Don't hold that against yourself.
Your thought process, for an adult, makes perfect sense Shezbut, and I understand you fully.

I don't think you're just blaming yourself. My only point is that you're blaming yourself
now, with years of experience and wisdom behind you, for something that happened
then, when you lacked those things.

I completely see your logic there, and I don't fault you for it. I would only suggest that you let go of the shame...you did nothing to deserve that.
Hugs,
Harley