This is going to sound really immature and I’m sorry

It’s literally been bothering me all day. My birthday came up so everyone bought stuff for the baby (there was a lot of stuff) so I brought everything in my room and my mom and I started organizing it. Now let me clarify I’m a teen mama of a baby girl I’m 19 and my sister is younger then me. So my sister came in she said she wanted to help I nicely told her to just stay out for now as there wasn’t even enough room for my mom and I. So my dad was standing there and said I was acting like a brat because she was the only one I wouldn’t let in again it was just me and my mom which I told him. So my mom goes past my words and says she can come in I told her I don’t want her in there’s not enough room she’s not going to be able to help much at all because there’s no where to even stand. She tried to pull the whole she’s bored thing on me but the issue is she doesn’t even want to talk to me until it’s something she wants to do like my daughter. Again I know this sounds really immature but it’s just frustrating because she tells me to get out of her room and I do without argument so when I don’t want her in my room I have that to lean on but it doesn’t seem to make a difference. She will walk in room without asking and I tell her to get out and I’m the bad person. My mom then went to go on and say that once my baby’s born I won’t let her hold her all because I didn’t want her in the room. It’s extremely frustrating for me!