Who said "I just prefer to do my suffering alone."?

This quote is attributed to Tony Stark.

I just prefer to do my suffering alone. - Tony Stark

"I just prefer to do my suffering alone."

Tony Stark Solitude

"I am Iron Man."

"Genius, billionaire, playboy, philanthropist."

"Sometimes you gotta run before you can walk."

"I'm not saying I'm Batman. I'm just saying nobody's ever seen me and Batman in the same room."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."