Am I being a bitch?

So my boyfriend and I weren't even together for 2 months before finding out I was pregnant, and I met his parents when I was 12 weeks along. I never really got to know them or him much before getting pregnant and jumping into a new family. His parents were extremely helpful throughout my entire pregnancy but now that my daughters here I find them judging me or constantly making a lot of comments on how I do things with her and instead of talking to them about it, I make bitchy comments back and whenever they ask to babysit I straight up say no! It's been causing A LOT of strain on our relationship but he's a mamas boy and will not confront her about how I feel. It's gotten to the point where I just wanna break up with him so I don't have to deal with the constant bullshit and judgement. Is there anyone that can help me before I make the drastic decision to leave my daughters father and break our family up because of his parents???