Getting things done is to be applauded.
Getting things done well is even better.
Getting things done and putting forth your best work is what we all should strive to do.
Doing your best work each and every day is difficult. To really do this, you must believe in yourself. Believing in yourself is the easiest way to quiet the voice of fear we all have. You know the one that whispers you can't do something or tries to convince you that you are in over your head or you are not good enough to get the job done. We all hear this voice from time to time, some of us more than others.
Don't let this voice stop you from putting forth your best work. The more you listen to this voice or give it any credit, the louder and louder it speaks. DO NOT LISTEN.
Wake up every day knowing you are going to put your best foot forward. Go through the day striving to do your best work. Put in the time and energy your best demands. Speak up. Take some chances. The more you do this, the quieter and quieter the voice gets. It never goes away completely, but you can train yourself to ignore it and do what needs to be done. It's not going to be easy, but learning to ignore the voice will change the way you live your life. You have something (probably many somethings) to offer, don't let the voice hold you back.