panicking about breastfeeding

I'm currently almost 34 weeks. I am panicking about breast feeding. This is baby #2, my daughter is 8 and I did not breast feed her. This time I feel forced to do it. My MIL is the neonatal dietician at the hospital so she is a huge breastfeeding advocate so I feel obligated. She has not in any way forced or even mentioned it and my hubby has said it's my choice. For some reason I have a huge fear and disgust of doing it, I can't explain it, it just freaks me out. I completely understand the health benefits for baby and I want her to be the healthiest she can be. I just don't know how to get past my fear. I thought reading about it, educating myself would help but it freaks me out even more. What do I do??