Breastfeeding woes

So LO is a week old and I'm worried about her feeding. I'm exclusively breastfeeding but I'm not sure she's getting enough. She only feeds for 10 minutes. Plus her poo is dark green. Her pee is clear. She doesn't always fall asleep after eating either. 
Plus, it hurts. A lot. To the point I dread feeding time. I feel like a terrible parent.