Dummy dummy!

I have no idea what im doing with these kids! Who ever said second time round its easier is a pure lier! Isla is a dream and flynn still seems to really love her! My problem is the breastfeeding. We have no routine at all. Im guessing im feeding her properly as it doesnt hurt anymore and by the feel of her shes putting on loads of weight. Other wise ive no idea if she is feeding well at all. I dont know if shes full or satisfied. She seems to feed ALOT! Mainly in the morning and around dinner time which is a bitch because I need to do things at both those times to feel human! I feel like I just feed her to send her off to sleep most feeds. So instead of being a dummy I consulted in the trusty mums of babycentre.  "No no dont use a dummy it will decrease your milk supply" were the  replies I got. Oh great. How ever hard I tried to listen I just couldnt. But I feel super bad for it. Am I just being selfish and stuffing rubber in her mouth when really shes hungry? But if shes hungry she wouldnt fall asleep would she? Oo the questions! Flynn had a dummy. This was because he was using the bottle as a dummy, giving himself wind, spuuing up what he had just eaten, thus needing more milk to fill the hole, back to square one, vicious circle.  Im thinking Isla is the same. A sucker. But my poor nips cant take the job of a dummy if this is the case. But I dont want to loose milk just because I dont have a clue what im doing! I nope this resolves itself as I really dont know what im doing.