21 years old carrpole tunnel left wrist doctor suggests surgey is this nessisarry?

If you are uncertain: About the medical advice you have received - a second opinion by a hand surgeon is a possible option.

No: It depends on the severity of ct syndrome including symptoms and ncv study findings. If severe then surgery gives instant relief and potential cure. Mild cases can be treated with wrist splint but eventually will progress. Sometimes cortisone injections are also tried and may work.