How is anyone living right now?

I honestly don’t know how much longer I can take this. How do people do things all on there own without any help at all? I’ve been single for 8 months now and my kids father will not help with anything. I just rolled my kids change from there piggy bank to try to get formula and food to last until wic comes in. I’m seriously feeling defeated. And like the worse mom in the world. How do you choose between food or formula? How can I keep doing this by myself when I don’t want to even try anymore. I feel so guilty every time my 14 month old cries to be held or wants my attention while my new baby needs me to tend to him. I feel so bad because I don’t want my 14 month old to feel left out or like I’m ignoring him. I’m trying so hard. I love them both so much. But sometimes I just want to give up.