Big part of the problem is a lot of women (not all by any stretch) think that you need to "grow up". Some feel that you always have to be changing in life or they need to be changing you. They can never just "be". Also, they fail to see that it's a hobby, or type of entertainment you enjoy. If you were not doing this you would be doing some other hobby. If you can't find a life partner that understands this or respects your "you time" your relationship is going to be full of the same. You also know she will be the type to talk behind your back to her friends about the "childish" things you do.
Good luck.