I'm ready to give up. (Long read)

Brittany • Been blessed with my rainbow baby girl. 21 years old. Married💕
I know that this will sound selfish, but I'm just so done. I'm 25weeks pregnant and I feel fed up with everything. I know that I don't have enough money for this but no one seems to be helping me. I'm 17years  old. I would love some support from family. Since I don't have any friends, but everyone seems to be turning away since my 23 year old sister just found out she's expecting. I still live with my father and step mom and they let my fiancé move in with me(he's 19.) but even he seems to be turning away from me. I have had to do everything and buy everything alone. I don't even drive and they get mad when I ask for a ride to the Drs. I have no problem riding the bus, but I'm on a watch from my dr and they even said I shouldn't ride the bus in case something happens. My dad and step mom have bought all these baby items, and told me and my fiancé that we can't use them because they bought them. They even have a crib in the living room, and I'm struggling to do everything. I have to walk to and from work. And then they get mad if I say I'm tired. I just don't know what to do. Sometimes I just wanna die and end it all....