United Kingdom, Feb. 15 -- Pete Davidson had no idea ho" tough" a career in showbiz would be.

The 31-year-old comedian first found fame when he joined 'Saturday Night Live' in 2014 and felt "so sad" upon rewatching his original audition as he admitted that he "picked the wrong business" to go into because of the way he feels about his mental health now.

He told PageSix: "The innocence in my eyes made me so sad. Showbiz is so tough, and I didn't know how tough it was. I picked the wrong business to have a mental illness and go into. I'm one of the most insecure and sad people ever, and I picked the most insecure, sad business to go into."

The 'Dog Man' star reflected on the obvious age gap between himself and his castmates at the time, ...