Breastfeeding is too demanding

Anybody else feel this way? I love the connection it gives us and the nourishment it provides and the fact that it's free, but I find it very demanding and stressful. I pump one my once a day because I'm a SAHM and she still cluster feeds and I always have to work very hard to make sure she has 2 decent bottles for when I go to class. The late night feedings are hard because it's all on me because we can't waste a bottle when I'm home and able to feed her. It's just a lot :(