You are a 12 year old boy and your best friend is a 12 year old girl is it ok if you take showers with her?

It's not a good idea. The fact that both of you will be naked just doesn't seem right for your age. Both of your hormones are racing at that age which could make you do sexual things.

its just not right for you age one or both of you might have hit puberty and are curious and you have tons of hormones and you could start doing sexual activities together