Rarely am I as boisterous as those around me. I decline to take front stage unless there's a need for it. For a long time I worried that my lack of boisterousness was interpreted as a lack of enthusiasm, or -- worse -- as a lack of conviction, as if I couldn't truly mean it without saying it loudly. But I am enthusiastic... in my own quiet way. When I'm bursting with joy, a warmth fills my chest, my face radiates, I tense up with excited energy, and I'm often paralyzed by the enormity of my feelings. It doesn't need to burst from my mouth in order for it to erupt from within me. I don't need to voice it in order to be certain that it's there.
I realize, of course, that there's something to be said about expressing myself to others, that it's a good thing. It doesn't need to be boisterous, though: it just needs to be true.