Not producing enough milk

Anon
Gah. I'm so frustrated with breastfeeding and pumping. I've been pumping every 3 hours or so every day for almost a week now. There is no difference or increase in my milk supply. I am able to pump only 2.5 ounce each time I pump and that's the total from both breasts. I'm massaging them, feeding baby with them and pumping but no difference. My baby is drinking faster and demanding more milk than what I can provide her with. I'm so frustrated that I want to give her formula. I really wanted to breastfeed her and now I feel as though I have failed. *sighs*