This takes years, it really depends on if your a: 1. Introvert. 2. Extrovert. Go to events, get outside, hangout with friends, be around a lot of people, make friends, and doing things you normally do not do, help you become less shy. I used to be really.... really... really... shy... So trust me, I know...

it isn't really a bad thing for a girl , but it may be embarrassing for a man.

For some people shyness is a natural state. It can be a some kind of auto protection. But sometimes you must endeavour to bypass it. You must have believe and courage for that. However for a women it can be a quality sometimes.

Don't be shy,Just try.

Maybe you can practice giving lecture to people and go out to play with you friends.