You just need to be up front with them - this is your child and therefore your decision.
I personally had DS sleep in a crib in his own room, pretty much from day 1. He never needed to feed as often as every 2 hours, even in the very beginning. And, even though it was more of a pain to have to get up and go into his room to breastfeed in the middle of the night (and he's an October baby and we live in Canada, so it was a COLD winter!), it was so great later because he was used to falling asleep on his own, in his own bed and room.
I would just tell them how you feel. Sleeping in the crib can help later in going to bed on their own and sleeping through the night. I breastfed my DS so it was easier for me to bring him to bed with me because I could just pop out the boob and let him eat when he wanted instead of waking me up every 2 hours!! But later on I had a lot of trouble getting him in his crib because he was used to falling asleep with me and staying with me so it kind of bit me in the butt! This time I'm going to get a basonnett to keep in the room so I can still have the ease of breastfeeding in bed but putting the baby back by itself until he/she needs to eat again.
People are bad about pressing their ways on other moms but just tell them thats how you feel.