Help me!

"Hi, I'm 16 years old and I've always had a great life with many good friends, but something has been worrying me lately.
When I was 13/14/15 I went with my parents to my grandmother and there was a cousin around 6/7/8 years.
I remember lying on the bed, she in the chair and I putting the foot next to the genital area (not exactly there), this lasted a few seconds, then I realized it was wrong and immediately took it.Also I remember once having shown Penis for her but also realized quickly (3-4 seconds) that was wrong and then pretended to be the bigger finger, I think she believed.
I have a great life, people usually like me a lot, I play football in a good team, I have a beautiful girlfriend who I love very much, but this has made me very worried and sad. And when I'm well I remember what I did And I do not think I should be happy.
I love children and they love me too, but this has made me very bad.What should I do? I'm afraid that one day she'll have problems because of this, I play a lot with her (she's 10 years old now) and she likes me.
What do I do? Please help me ... "
I made this post about a year ago, most of the time I was fine, but now I remembered some important things, from my 7 to 13/14 an older cousin 3 years did inappropriate things with me, most of the time I was not comfortable and I think he realized. It was about 7 years like this, I do not judge him, but could it have triggered everything else? Today I'm fine ... Very well in life but sometimes this is still I worry ... I do not sexualize children nor do I think of doing them anything. My cousin also seems super good. My fear now is having to go to a correction house or something. Thank you!

I think it's entirely possible that your own experiences triggered your behaviour, which I think was regrettable, but less dramatic or violatory than you fear

To an outside observer you playing your foot on/near your cousin probably wouldn't be regarded as sexual. In terms of exposing yourself - it was wrong and inappropriate but w/o any other behaviour, I personally doubt it would have been upsetting or traumatic to your cousin. Nudity is not traumatic per se, though obviously it can be highly inappropriate.

You are, at 16/17, still a child yourself technically. As such, you should allow yourself to draw a line under your behaviour and who you are/were as a child when you reach 18. Consider it a new life and do your best!