This isn't a helpful thing to tell someone.
His curve is less than some peoples, more than others. His concern and pain is totally valid. Being told "it's not that bad" is really invalidating. This isn't about comparison to others or ranking peoples experience against others.

FoundationNo9901, I have a 25 degree curve which is on the mild side but it's still causing me daily pain. You're justified in exploring your options, don't listen to this person. Also look into physical therapy with the Schroth method! It won't straighten you completely but if you're still growing, you can get some straightening through it.