Hate breastfeeding

My second baby I want to breastfeed as long as I can my first I only could for 4 months then I just got lazy with my supply and it dried up I also didn’t know much this time I’ve done tons of reading for years and my 6 day old is breastfeeding she’s fighting latch but we are trying and she does have good latch sessions she just latches then gets mad and unlatched I see milk so I know it’s not that but I freaking hate breastfeeding only because I’m not seeing how much she is getting and I constantly find myself worrying that she didn’t eat enough even though she sleeps long then feeds and is out for at least 5 hours I either wake her to feed or pump