Do kids really need both parents' families to be their "family"?

My boyfriend’s family, well I should say, the family of the father of this baby I am pregnant with do not care about me or want anything to do with me at all. It’s not that they hate me or anything (I hope…) but no matter how hard I try to be closer to them and get to know them, they just don’t seem to care enough to get to know better about me. This is making me want to keep my baby away from their family. Since they don’t care about me at all, why should they care about the baby?! As much as it’s my boyfriend’s, it is MY baby. If they don’t want to do anything for the baby even before he/she is born, I don’t think I want them to do anything for him/her even after he/she’s born. Is this bad that I think this way? When the baby grows up, he/she can make his/her own decision to have relationship with his/her father’s side of family.
What do you all think?