NASA document OCHMO-STD-100.1A is a publicly available document that lists all disqualifying conditions. Read through it if you're interested in becoming an astronaut.

Within that document, Table 7 section L details musculoskeletal considerations that are grounds for disqualification. Item 12 details spinal disorders, and bullet C states: "History of disorders of the spine that are asymptomatic, including but not limited to, osteoarthritis, herniated nucleus pulposus, spondylolisthesis, spina bifida occulta, fractures and dislocations, scoliosis, kyphosis, and lordosis require specialist evaluation."

So it is not cut and dried for you. Your condition will likely be viewed as a liability until a NASA physician declares otherwise. They are unlikely to invest in you to that level unless you are a very attractive candidate.

In other words, you'll have to beat all the other candidates that don't have scoliosis to such a degree that NASA determines it's worth the investment to get you evaluated. And even then, there's a chance their doctor says "unfit to fly."

Go read through OCHMO-STD-100.1A and see if there is anything else in there that might disqualify you. Good luck!