I have scoliosis since 15 years. im 25 now but i do not have pain it is olny like a bad back posture should i go for surgery or not?

Hard to speculate: Scoliosis is a label with a wide range of impairment.It can be almost undetectable to quite profound, impinging on the lung capacity & function. Many docs would never consider operating on lower degrees of defect , reserving this major surgery for those that cause significant functional problems. This is best discussed by those who know all your x-ray and other test results.

Scoliosis: Really it depends on severity of the scoliotic curve and whether you have symptoms. Surgery if done is quite extensive any decision should not be taken lightly.