kissak, shy and quiet does not have to mean low self esteem. Not all confident people are as obnoxious as I've turned out!
Saying you just need to NOT be afraid is one thing. NOT being afraid can be super hard ... until you really unearth the WHYs. Dig deep ... what is/was causing the insecurities that led to your low self esteem etc ...
Holding onto anger to punish someone else, is like lighting yourself on fire to get smoke in their eyes ~ 25yearsmlc