Forgot to flush. So embarrassed please help. What should I do?

Anonymous
Long story short in a crowded bathroom after school. Walk in there's pee in the toilet. I change into my gym stuff in the stall go to the bathroom, pee only, finish changing and walk out quickly because there is a long line. I realize I forgot to flush. The girl next in line looked inside at the toilet make a disgusted face and refused to go in. The girl behind her went. I was so embarrassed. What should I do to get over this? Am I totally overthinking it? Does it even matter?
Forgot to flush. So embarrassed please help. What should I do?
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