Am I wrong for not wanting to cook for anyone but my kids?

I have two kids. A 2 year old and 3 month old. My kids father mother recently bought a new house and wanted her three children and their kids to move in with her. I am not close with any of them and unfortunately I didn’t have much say in the move because I’ve been a stay at home mom and don’t have much of any savings of my own (stupid on my end). My boyfriend sold the home we were living in and we moved in with his mom. I’ve been suffering with PP badly but I’ve been trying to push my feelings to the side because I’m always the bad guy when I voice how I feel…which is me not wanting to be here. I’m very uncomfortable here(I’m uncomfortable anywhere that isn’t My Home) no matter how hard I try I cannot get comfortable, and I have always done so much better in my own space. It’s nothing against anyone…it’s just who I am. I do not like using anyone’s kitchen and when I do it’s always a comparison on my cooking versus the other women in the home. I don’t have much but I do contribute $800 a month for food and that doesn’t last at all. I told my significant other that I will only be cooking for my my child, myself, and him (if he would like) and I will not eat anyone’s meals because I feel as if it’s unfair for me to do so even if I am contributing money for the groceries. To be fair I discussed not wanting to cook for anyone other than my family in the home before moving in, and it was fine but now that we actually moved in his mom and sister in law always has something to say about me not cooking for the family. Unfortunately he has zero plans of leaving anytime soon. I’m 26 and he is 28. He wants to find a house of equal size with a nice yard like the one we currently live in (3000sqft with 1acre yard) but he isn’t even working and he’s talking about staying here years from now and that just will not work for me. Every time I try to talk to him about it he tries to make me feel bad for wanting to find an apartment because the kids rooms will not be as big and they won’t have a big yard if any. Sorry.. I just started venting