Who said "Why do I always feel like I'm on the outside looking in?"?

This quote is attributed to George Costanza.

Why do I always feel like I'm on the outside looking in? - George Costanza

"Why do I always feel like I'm on the outside looking in?"

George Costanza Solitude

"I'm out there Jerry, and I'm lovin' every minute of it."

"These pretzels are making me thirsty."

"Master of my domain."

"It's not a lie if you believe it."

"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."