Breastfeeding doubters

Je
How do I respond or deal with people who tell me not to get my heart set on breastfeeding? I'm going into this with the mentality that I'm doing it. I feel like if I start thinking, maybe it won't work... I'll be more likely to give up. I understand that it can happen, but I want to have the best chance for success. This is mostly coming from my MIL since she couldn't breastfeed.