Oh Surreal thank you

This was all so long ago but I really do feel like a terrible person about it still. These days I ALWAYS intervene if I see someone being bullied or attacked. I know the shame of walking away and I never want to feel that way again.
All that remains is to apologise for the genuine bad behaviour and acting out. I'm sure my family would love to hear an apology and an explanation (but not an excuse).
I still feel too much shame and embarresment to go there though.