United Kingdom, July 23 -- Billy Joel has always "resisted" making documentaries about his career.

The Piano Man singer explained that he has been hesitant to let the public into his life as he is "sick" of talking about himself before he agreed to the making of the two-part HBO documentary Billy Joel: And So It Goes.

In an interview with People, Billy said: "I've resisted this kind of thing for so long. I'm sick of talking about myself. Some of the stupid stuff I did, that's painful to talk about. (But) they asked me for some thematic guidance. I said, 'Just tell the truth.'"

The documentary delves into how the Uptown Girl hitmaker has overcome substance abuse, failed marriages and mental health struggles during his lengthy career and...