How tf am I supposed to live off $20/hr?

I am a single mother of two teens. My rent is $1,475. I have to pay a car payment, insurance, cell phones, water, electricity, food . And my job is an hour commute so gas is crazy. No child support because he is jobless living off his momma. I just don't see how I'm going to manage. I don't have family to ask for anytime of assistance. I feel so worthless and sorry for my kids. I know I'm not the only one struggling this way but damn sure never would have thought I would be facing life alone after an 17 year relationship with my ex/bd