Why would you do that? Your girlfriend should accept you the way you are. As long as you have time for her too there shouldnt be a problem

My boyfriend and I are gamers. I enjoy watching him play games and we often play together. I am 21 and he is 24. We are even talking about creating a game room in the house we are getting soon. Everything from our wedding to the birth of our first child is planned to be very nerdy. Everyone has something they are passionate about. If people point out that I'm wasting time I point out that they just sit and watch other people play sports, spend 100s in shops, ect. We all have our crutch. The biggest prop is that you are trying to get rid of yours. Others see it as "just a video game" but they don't realise just how important it is until it is pushed into their face in reverse. Don't listen to others and keep doing you. One day you will get there it just takes time. One step at a time OP, you got this.

Having hobbies and interests is not immature. You won't prove anything by deleting your character.

So you have a WoW hobby, who cares? Do what makes you happy bro.