Singing loudly

I have a terrible voice. This I know. However, when no one is around, I enjoy singing loudly esp. in the car. I think it is something almost everyone does. It is a feeling of freedom to sing at the top of your lungs. It is the same feeling I have when I am standing atop a hard rock climbing problem looking down at my accomplishment or when rock something like no other. I want to be able to take this feeling of utter confidence and translate it to other portions of my life. I want to be able to sing at the top of my lungs with others around. This is what I desire.