I really don’t think you F’d anything up, OP. It doesn’t sound like you’re doing anything with a evil intent. You are joking around making yourself comfortable and trying to have a good time with those around you. Maybe she has some sort of insecurity about you with potentially other girls?

The lesson in your situation is pretty simple. Why would you want to alter or “hide” who you are daily just to fulfill this “image” your partner wants from you? Not a very genuine relationship if you ask me. This is a person you truly love? When they can’t love who you genuinely are? Hmm…