when you do something with your substantial efforts and when you say yourself, I am a go and getter. that's called confidence. Confidence is something, that motivates you from inside, that you can do it and you have the potential ability to make things happen. that's called confidence. I give you an example, may be this example is some how different but that can make you understand, for example, it's a Friday night and you all your friends are boozing together, you find your drinks are getting over and one of your friend said, what should we do now, we may not get any drink at this time, as it's too late now. You got an instinct and said, I know one shop and i know we will get our drink there. that's called your confidence, that you can go and get it for your friends.
hope, this may help.
Regards
Hota