My girlfriend says i dont do "manly" things?

the thing that she probably doesn't like is that you're insecure. so be a "man" by being confident, and not giving a f**k what she thinks about what is manly. it's more "manly" if you can stand up for yourself, and not be pushed around by a betchy girlfriend. have some confidence! sounds like you're a successful guy, and make her realize that she's lucky!