my body hurts and I'm scared

I dont want to be disabled, I dont want to have to live with joint pain, I dont want to have to plan my day depending on how far i can walk. I dont know what this is, probably its arthritis, but whatever it is it doesnt mater because it hurts and it isnt going to stop hurting, I have had leg pain for three years now and it gets steadily worse. soon enough standing still for any amount of time at all is going to be an imposibility which means I will have to take my crutches everywhere,all the time which is tiring and a pain in the arse because the world isnt designed for people with crutches