Just me airing questions to myself

Had a chat/argument with the gf last night, I pushed her on the subject of why she doesn't want to go to my mums for a holiday. Its because she feels she wouldn't be relaxed and also because she thinks my mum belittles her, I haven't been privy to conversations where my mum might have done this but my mum is normally straight to the point/untactful. I don't know whether I should say anything to my mum about this or not.

I was accused even if the words weren't said of being selfish, the reason is because she wants to do more things as a family and I have said that's fine, but she will have to pay for it as I don't have much spare income after bills etc are paid. She then moaned at me because I am going to a stag do in July and the Reading festival in August and I also play football 1-2 times a week. Sometimes football will cost me £5 for the week, sometimes on a Wednesday it will cost me a bit more as I will stay and have a couple of drinks afterwards. My gf doesn't earn much, about £300-£400 a month and with that the actual amount of bills that has to leave her account is about £80-£100. The rest she says she spends on our son, which she does spend quite a bit on, new clothes, school shoes etc but these are not monthly costs and moans that she doesn't have enough to spend on herself, even though most weeks I get home there will be bag from Jane Norman or other clothes shop.

I have said that I would like to do more as a couple and she asks me who is going ot babysit, I didn't dare say her family as I knew she would moan about it and why don't we find one, but she tells me she doesn't want a stranger looking after our son. I tried to say that we could just go out for an hour or so and see how that goes but that fell on deaf ears.

She told me we have to be more of a family before we can be a couple, but I don't see how this works, maybe its my male brain or am I concentrating to much on being a couple. As a couple I feel we have drifted apart and sleeping in different rooms really doesn't help, but sometimes my snoring can be very loud that it is just easier for both of us for me to do this so we get some sleep. I am not massivly over weight, I weigh about 12.5 stone. Our sex life if no existent and we haven't been close for what seems like ages now.

I'm not sure if I am posting this for advice or just comfort but thanks for taking the time to read and sorry if its a bit long.