Worried about family😔

Jessica
So me (19) and my partner (22) have been together for 4 and a half years and this is are first baby, everyone is over the moon that I'm pregnant as it has taken just over 2 years for it to happen for us. But I'm worried that they are going to try and take over, I feel guilty saying no and don't want to upset them, I said that I just want me, my partner and my mum in the room and once the baby's been born also my dad, his family are obsessed and his mum also thinks and keeps given us hints that she is going to be the mum, she called her self the grand mother the other day and actually emphasised on the mother and repeated the mother part. I got really upset as its not her child. My family is rather large and I'm so worried they will just all turn up at the hospital without my permission, or even be sat in my parents house waiting for us to arrive home and just take my baby away from me and pass the baby round like its a toy. I want to spend some quality time with my child and my partner but I just know that I won't get that chance. Even saying I don't want them there won't stop them. I know that as soon as I walk through the door they will want to hold the baby and not even give me a chance to bond with my child and take over like its there child, It's really starting to stress me out and I'm not sure what to do, any advice???