Slang: "gun-shy"

“[Fame and success] just made me kind of gun-shy.”
Fred Durst, lead singer of Limp Bizkit, in an interview with MTV.
 
Someone who is gun-shy is a little bit afraid or uncertain to do something. In this example, Fred Durst is talking about making and releasing a new album. His previous albums were so successful that he was afraid his fans wouldn’t like his new music. Now, he’s a little gun-shy when he’s in the studio trying to record new music.

Examples

“I’m kind of gun-shy when it comes to giving public speeches.”