I don't want to spend time at my girlfriend's house
What is your reason for not wanting to spend time at your girlfriend's home?
It's too small and we always end up not doing anything at home because we feel claustrophobic, besides the fact that she has so many things to do at home.
You should always try to make time for your gf. You should go to her house sometimes, at least. It's only fair.
Well, maybe, but I can't be forcing myself to go.
Maybe you can agree to one day and week and plan something fun to do each time so it doesn't feel like forcing yourself.