Come out of your shell
Definition 1 of 1
Pro Tip 1/3Social Confidence
Used when someone becomes more socially active and confident in group settings. 
He used to avoid conversations, but he's really come out of his shell this semester.
Pro Tip 2/3Positive Change
Indicates a positive transformation in someone's behavior or attitude. 
After joining the debate club, Clara has come out of her shell.
Pro Tip 3/3New Environment
Often used when a change of environment triggers someone's newfound confidence. 
Moving to a new city helped him come out of his shell.