Low milk supply

My baby is 2 weeks and 3 days and I’m literally not even pumping a lot of breast milk.. She doesn’t latch so I’m exclusively pumping.. i started pumping every three hours and I don’t even get an ounce.. I pump a lot every so often but the flow doesn’t stay.. I pumped 3-4 oz the other day but that’s the only time I’ve pumped that much.. I normally pump 1oz from each breast and put them together but my baby is still hungry.. I’m formula feeding too but I’m trying to get her off formula and strictly breastfeed. Why is my milk supply so low? I’m confused.. I’ve been pumping religiously and I try to pump til empty. I only pump a good amount if I don’t pump for a while. I’m getting really discouraged at this point when there’s ppl who’s not even trying to breastfeed and they have an oversupply of milk🙁