Is there any hope for my skin?

I had pimples and acne problems from teenages. Despite of taking lots of medications and treatment form dermatologist didn't had any effect. Now its stopped naturally after 24 . But the acne and pimples left deep scars on my skin. My dermatologist advised me to go for co2 frictional laser. I went through the procedure but didn't get any results at all. Can multiple sessions help?... Should i go through the procedure again? How many sessions will help me? I can go through multiple sessions anyways but its too costly and I am not sure about the results. Please give me your suggestions. Thank you.