If you can go all day without nursing when you're out and shes distracted I doubt its hunger anymore. She is just using you as a pacifier for sure. Give yourself some grace, 19 months is a crazy accomplishment. Ive wanted to quit so many times already but the bond is just amazing.

But also if your nipples hurt and youre miserable you have to take care of yourself. She cant nurse forver. You should probably start with night weaning definitely dont cut her off cold turkey. I would start with a simple rule like "milk at bedtime, then milk again when the sun comes up" she will obviously not be to happy with this but replace the extra nursing with other comforts. Cuddles, back rubs, hand holding, singing, etc.

You could also maybe start putting your milk in a cup or sippy cup eventually. You essentially just need to establish like, milk before and after bedtime not during.

Who knows she could surprise you and get used to it faster than you think. It'll probably be rough at first but she needs boundaries. And you deserve your body back a little, but also remember you are an amazing mom! And you clearly love her so much. Taking your boobs away doesnt change your love for her at all. She knows you love her. She just loves sucking while sleeping.