I have dreams like that sometimes, usually invovling my stepdad, my brother or this guy called Mark Rowley I used to hang around with years ago. All three of them kind of bullied me at some point, or are bulllies or considered hard men, like your boxer friend I guess? Not that he's a bully, but that he's considered quite tough?

I think it might have to do with self-confidence, like perhaps you are going through a patch in your life where you're feeling a bit down on your abilities in some area, or even something specific.