Praying for guidance, I am so afraid

I am struggling to make a decision. Part of me knows my situation and circumstances. I am already a single mom of two and that father is a complete deadbeat. Now I am pregnant again but I thought this time things would be different. I say that because without going into much detail my partner does reassure me that things will be okay but he’s also not who I thought he was. So I feel trapped. I feel like if I do have an abortion this far along I will never forgive myself, I don’t even know how I would cope. I thought to myself that I could just drink to cope with my feelings but then I’d be turning into an alcoholic which wouldn’t be fair to my older children. I know that I already support two children completely on my own but I just feel like I don’t have the support I need for this pregnancy. Most of my family tells me to keep it because the baby is already there and it’s wrong to abort. But I just feel like I don’t have the support I feel like I am going to be depressed my whole pregnancy and who knows how postpartum will be for me. I’m scared and alone because I know at the end of the day no one can help me decide it’s ultimately up to me. But damn, I just cannot believe I did this to myself. And I can’t believe I’m even thinking of aborting… I feel so guilty.