Immature or foot down?

My baby daddy’s ex messaged me and told me how he told her he cant Have kids and that she doesn’t think it’s his and all this stuff and this ex is friends with all his family. And his family well they are friends with all his ex’s none of them have any kids with him. It has come to my attention I haven’t been able to enjoy this pregnancy because A) his family doubt it’s his kid. B) I now have his ex messaging me telling me shit like that. And it’s just been miserable. I am 8 weeks away from having her and I’m at my breaking point. I don’t want anything to do with anyone. As immature as this sounds. I am about to make a public fb and say everyone who’s not being supportive about this I want nothing to do with you and anyone who’s friends with his ex’s to I friend me and to not contact me. Is this selfish and immature. I have tried ignoring all this drama the last 8 months but it just keeps coming back. Please help me.