Not to scare you but you may have what is known as
Scoliosis.
It's when your back is like this:

Most of the time you feel perfectly fine, but if you move a certain way it will cause it to hurt for a long ass time.
My mom had it and it never bothered her until she bent a wrong way and it never stopped hurting.
She went to a doctor did x rays, etc and they found it.
It took her around 12 months of going to physical doctors and helping her straighten her back a bit.
My sister also partially has it but just back pains, not scoliosis.
I do not, I always lift with my legs and never my back, I hardly bend all the way with my back either.
Having a back pain (or pains on your spine) are one of the worst pains you can have.