What should I do if I never saw my chlid and i want visitation or share custidy rights?

I got my ex pregnat when I was 18... We broke up...so I never had contact with her about the child...now he is 5 years old and I'm paying child support but I want to see him....Iwant to make up the years i didn't have with him....Why i never took the chance in the first place was because I was young and scared... Her mother prest charges against me and told me that I would never get a chance to see my child or I'll get locked up again.... I tried to reopen my case but without her address I can't. I look through the files but there was no address...so what should i do I'm 24 now...