Breastfeeding disappointment

My baby was born on 2/18, 1 day shy of 35 weeks. I was unable to breastfeed her until the next day and they had me pump 6 hours after she was born. Since then I have been struggling with breastfeeding. My baby will not latch, I have been consistant to offering her my breast first, in the end she ends up with formula. I had tried to pump every 2-3 hours but it's not working, I only produce 1/2 to 1oz on each. And to make things worse my anxiety has tripled and I may need to go back on medication. I feel so guilty and feel like a failure. I really had my heart set on breastfeeding or atleast breast milk. My supply is terrible and I don't know what to do.