Baby hates my nipple?

So

These few days it takes foreverrrrr to get baby latched. Hell have his mouth open and maybe lick my nipple or pull away Til a long time later he finally latches

How do i know if its bc he 1) is full 2) is sick of sucking on a nipple that has nothing coming out?

Baby is 5 weeks today. I thought itd get easier but its not.

Im also worried bc he doesnt sleep well and i feel like maybe hes notgetting enough from my breasts. I had to supplement first few weeks and ive since been trying to just do breast with maybe one or two supplements with pumped breastmilk per day but its really hard to gauge whether or not hes getting enough

So overwhelmed.