I'm going to come down on the other side of this one - I'm a parent of a special needs child. My son has cognitive impairments rather than physical ones, but the underlying parent-child dynamic is similar I think...
I would talk about it with your T, but I think your relationship with your parents could really benefit from being honest with them about how you feel. Often typically-abled parents simply don't understand their differently-abled child's limitations very well. We judge from our own position. We want the best for our children, but our outlook is often skewed. I can totally understand why your parents let you endure the painful physical therapy

My son has had a lot of medical intervention and I know how easy it is to become numb to it in the name of doing what's 'best'.

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