Breastfeeding in our society is often a confidence trick, ladylove. There are so many stories of mothers who have 'failed' and so many who are more comfortable with bottle feeding, where we can see exactly how much our babies are having. It's no wonder we worry...
Fussing, cluster feeding, waking to feed, frequent feeding - these are all quite normal things (we often label them as 'bad' in our culture, but they are actually biologically normal). The best indicators of how much your baby is getting are nappies, overall appearance/demeanor, weight gains, growth, development, etc.
It sounds like you know she's doing just fine. If you're concerned you can always give the ABA helpline a call for reassurance too - 1800-686-2-68

Check out the baby wearning forum for advice, if you want. A good sling/carrier is invaluable for mothers, I reckon.