I ignored a girl getting abused. Am I a piece of shit?

This was in 2014 when I was 20. I went to san Francisco with some family. We were near a park with some thick shrubbery and trees. My brother and I were standing off to the side waiting for my mom and sister to use the bathroom, when we heard screaming, and slapping sounds. I began to walk over to see what was going on, but my brother begged me not to get involved, so I didn't. I obviously should have called the cops, but I didn't. I still think about it 10 years later, and it makes me nauseous.

I ignored a girl getting abused. Am I a piece of shit?
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