Why this is happening to me

When everyone talks about let down and their babies are drowning in the milk, you alone not able to fulfill your baby’s basic needs. You can’t afford to buy formula . Why I’m not able to produce as many mothers are producing. I’m eating well and drinking water a lot. But, there’s a pain and not able to produce more to even feed the baby one time. I bought a box of nursing pads and now I don’t even produce half. How am I going to feed my baby with bm when I go back to school where everyone else store for a year. It’s not jealousy, it’s frustrating. Breastfeeding is painful and tried all possible ways.I feel guilty giving him formula and I blame myself for being such a useless mother. I wish I could give a mother is supposed to give for their baby.