Breastfeeding and supplementing

Feeling really sad and guilty that my breasts aren't making enough milk to exclusively breastfeed. I have to offer her formula after each feeding. In the morning she doesn't need it but as the day goes on she's still hungry after I breastfeed her. Does any other mom do this? I try pumping but barely get an ounce 😢 I'm only a week in so maybe it'll get better