[FingerLakes]

Asking silly questions like why doesn't Superman's cum kill Lois is the kind of thing real nerds do in our spare time, so I'm just glad the Keith is really one of us.

Cap Marvel got her powers from alien technology; she learned to control and increase them by believing in herself. It's a pretty common beat in all these hero stories. Clark sees his ghost dad who tells him to try harder and suddenly he's faster and stronger, Peter remembers Uncle Ben and the same thing happens.
For what it's worth I also thought this movie was kinda boring and lacking. Thank God for Aquaman and WW