my mom thinks we had this baby together
I told her my bd would be in the delivery room. She said "for what?! what purpose does he serve?!" I'm thinking to myself the FATHER role, the creator. Then she wants to be in the room & I really want that moment to be personal btw me & the father. She doesn't like him & tries to overstep his father role all the time. He's 20 I'm 18 don't have kids young!! Anyway I actually planned on moving in with him because we had a kid and he needs to take care of him. My Mom said no he just needs to pay child support & stay in his lane but he actually wants to play an active role in his child's life which is actually quite rare.

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Take the advice of blueberrys mom, your mom though she wants whats best she will continue to overstep if you don't step up to her now. Non confrontationally. My other good advice is unless hes abusing you in any way do not talk bad about him to your mom. She doesn't need to have fuel for her fire.