nervous breastfeeding

I have a 15 hour flight coming up with my husband and three month old. I am so nervous to breastfeed in public. I've never done it. If we were out and about I'd either have a pumped bottle ready or have gone out to the car. But I have no choice but to breastfeed in public this time. I have huge boobs and am plus size and I feel critiqued for being overweight in the first place, it's unthinkable to me to breastfeed in public because I'm so self conscious. I think it will be okay on the plane and in my seat but doing it in a busy airport scares me 😔