Some good advice and thoughts in this thread.
All I can say is that I was in a relationship a few years back that last about 3 years. Year 1: pure greatness. Year 2: little problems surfacing. Year 3: Steel Cage Deathmatch with ladders.
I let my desire to want to be in love and be needed clouded my vision of what was actually going on. I was being someone I wasn't and trying to fit w/ someone that wasn't a match. I lost touch w/ my friends, not because she demanded it, I just let myself get carried away.
Point is, if it doesn't feel like a great match from the beginning, be it conflicting interests or lack of compromise on either side, it's probably not going to get better.
It doesn't have to be totally on you to give up your hobby. She said you don't, but then said what's more important: her and the kids or games? That makes it seem like she's not considering your feelings at all.
Also, you're 25, test the waters!