alone

Guys, I just don't know what to do anymore. I feel so alone. I feel like I'm drowning in stress and depression. I feel like I have no one. I understand that my best friend has college and work that keeps her busy all of the time, and I'm not mad at her.. But everyone else just seems so distant.. My sister was my "go to" person. I would go to her about everything. Now she's back with her ex that went back and forth between her and his coworker.. She's a completely different person when she's with him. She ignores me when I try to talk to her. We haven't talked in almost a week and we live together.. And he's just an ass in general. He used to make jokes about me while I was pregnant and they were hurtful jokes honestly. And my fiancé just seems like he has other things going on in his head, like he doesn't have time for me. He isn't there when I need a shoulder to cry on.. My mom doesn't even communicate well with her husband, I know she won't want to listen to me complain about what I'm going through. I've tried talking to her. I have a 4 month old baby and I'm new at all of this. I need someone to talk to. My baby is the only thing that makes me happy anymore, but I can't talk to her because she can't respond.