Breastfeeding concern!

My baby boy is 3 weeks and 3 days.

I am concerned he is not getting enough during feeds. He barely latches, mostly 5-10 minutes then he falls asleep ! I try to touch his cheek move positions, switch him to other breast, and it’s so hard to have him latch on again !! Because he’s sleeping…

Is this normal ???

Does it mean he’s full when he sleeps?? Sorry new mom here