I got the same, lots of people telling me not to have my heart set on it.
I think lots of it was out of genuine concern that it would leave me upset if I had been unable to as pp have said it IS difficult.
I was determined to do it through mastitis, over production, cracked nipples, reflux puking baby and the general exhausting struggle it CAN be early on. There were points though where I was very jealous of some of the ff mums in my new mums group who shook up their milk and shared night feeds with their DPs whilst DS clawed and screeched at my sore boob both wanting and not wanting to feed!
Despite all the difficulties, it hit a turning point and it all fell into place and its been a wonderful, fantastic journey with DS still feeding at 14 months.
I'm pregnant with my second and looking forward to taking on the challenge ahead again!
To sum up, I think people are trying to be kind and let you know that if it doesn't work or you don't enjoy it, there is no problem to ff, which is exactly the right attitude. The way they are doing it is a bit clumsy and it can feel like they just don't have faith you can do it/ don't support you.
Good luck and congratulations! 