Breastfeeding Demands

I’m really struggling with the demands of breastfeeding as a FTM. We are doing on demand, as well as supplementing each feed with some pumped breast milk to build back to birth weight. I think my baby is cluster feeding (she is around 7 days old). It feels like as soon as we get through one feeding (waking, feeding - with multiple attempts to keep her awake, dealing with hiccups, keeping her upright), it’s time for another feeding. I am using a nipple guard because she has trouble latching, so that’s also a part of it - keeping it on, etc. I’m just not sure how this is sustainable. Any advice appreciated.