feeling worthless

I'm currently pregnant I'm 9 months next week, and I'll be having my baby soon. Well, I've been thinking for the last hour and I just feel so worthless, because I don't know how I'm going to do this alone. 
I don't know how to put a baby to sleep, how to feed her(doing formula), change her diaper, or do anything. I'm a single mother and he left me when I got pregnant, and I'm crying because I won't have any help because my mom lives 45 minutes away and I don't think my dad will help me. 
I don't know what to do 😭😭