I was diagnosed with clinical depression at age 16 and was on prozac for a year. During that time I coped and after six months I tried taking myself off the medication because I did not like the feeling of being medicated. I have been free of this for nearly 20 years. I have had no relapses, I have never been medicated since then. I also attribute my falling into it in the first place due to lack of coping skills since I was so young, given my life experiences since then I don't know how I let myself "slip". However, will this prevent me from ever becoming an airline pilot? I have saved up the money to go.... Even if I get evaluated and given a clean bill of health does this doom me to be forever be thrown on the "reject" pile???
It does not sound like a dealbreaker, however I'm not an aviation medical examiner. I do not think that depression diagnosed when you were a minor would prevent you from becoming a commercial pilot now, I do not even know if you would be required to declare it to an airline on an application. The biggest hurdle you would have is the medical I would expect. You might need to have a psychiatric evaluation, or it might be far back enough that isn't necessary. It likely depends on the severity of the depression you were diagnosed with on the DSM (diagnostic and statistical model of mental disorders, a tool used by professionals to assess and diagnose mental conditions) scale.
My recommendation would be to talk to an aviation medical examiner. Many pilots deal with, or have dealt with depression, sometimes severe, so it should not be hard to answer. You lose nothing by trying.