i don't think what you're saying classifies as "no medical reason" - if you're in such significant pain now with the scoliosis, there is a medical reason

it is entirely your choice if you decide to have a c/s - i guess one thing to consider is whether or not the pain will be relieved by the c/s or not - if your recovery is going to be equally painful with your back post partum from c/s as it would for a natural birth, is it worth the additional surgical recovery time? will an epi or spinal block give you pain relief enough to manage with natural labour.

there is a lot to consider - and only you can make that decision - don't let anyone else force you one way or another though. don't allow yourself to be scared into a c/s or forced into trying natural labour - you will make the decision that is mor appropriate for you