How can I get my six month old baby to stop using me as a pacifier?

I have a six month old baby who is still waking up every one to two hours to eat. Sometimes she gets on the only to immediately fall back asleep. I cannot get her to use a pacifier. She is a BIG girl despite weighing 5lbs14oz at birth. She now weighs 18.5 pounds. I have tried feeding her solids but this has not helped her to sleep at longer intervals. Being up all night is killing me and I don't know what else to do.