babies father left

I left my home with friends and support system because my boyfriend wanted me to come live with him and start a family. I ended up getting pregnant two and a half weeks after being here I'm not 21 weeks as of tomorrow. He started distancing from me and talking to other people and just told me things change and he can't do this anymore and he'll pay child support but he cant be in his life. My grandmother said I can move in with her but it's not permanent so I'm just terrified. I'm having a boy and I just am scared I know nothing about boys and how to attend to boys needs. Then finding a place to live when I messed up my credit when I was 19 I can't get approved to rent anywhere. I'm just terrified of everything right now and don't know how I'm going to do this alone or tell him when he's old enough to ask where his daddy is. Now I have to make this 16 1/2 hour drive home alone with not much money since I have to start buying baby stuff alone I can't afford a hotel to stop at. And it may sound selfish but I'm just upset because I know no guy my age will want a girl who is 5 months pregnant or a single mother and it upsets me. I guess I'm just looking for advice from anyone at this point.