Telling a joke but nobody laughs afterwords.
Worrying about unnecessary topics.
Irritating a person, whether purposely or unaware

Example 1: Joe-"I finished my project yesterday!"
Kevin-"But it's not due until next Friday.."
Joe-"Yah, I just stayed up until 3 o' clock doing it."
Kevin-"Aw, you're doin' too much.."

Example 2: Dion-"I wore a Hollister shirt yesterday,
now i'm afraid that i'll become a different person if
i start wearing it regularly. i should put this as my
Facebook status!"
Jay-"You're doing too much.."