What does "coming out of my shell" mean?

• stop being withdrawn; open your heart and mind to life; stop being insecure; stop being shy; become more confident Also: become happier and less upset; change your mood from bad to good; stop thinking about your sadness and start thinking about positive things; A good thought from Srikanth: "The phrase brings to mind the tortoise: it goes into a shell when it feels insecure and comes out when it feels better."
• keep track of; pay attention to; be in control of
• something that damages your reputation

Practice: coming out of my shell