Nervousness doesn't have to be a bad thing, it is natural to feel nervous when you are exposing yourself to others, just be open to all forms of praise and criticism. Remember why you are doing what you are doing and that your reason is greater than your ego. As far as being able to volunteer and write might suggestion is to start your day earlier or if you are a night person stay up later. For me the early morning has become my most productive time of the day. Also from my study many successful person whether they be artists, business people, or holy people swear by the early hours of the day, when the world is quiet.