Is breastfeeding really that hard?

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I'm 27 weeks pregnant and I want to breastfeed my baby so bad but everybody who I talk to tells me I can't or that I'm not going to. My MIL laughs at me every time I say I'm going to breastfeed. Is it really that hard? I've been doing tons of research since I got pregnant but everybody is making me feel like it is impossible. My biggest fear is not producing enough or drying up. Any advice?