I feel you should definitely let the Pastor know what you can do, but don't limit your self. Maybe this is God pushing you into your destiny. As long as you practice like you should, and you are seeking God concerning the talent He gave you then everything should work out just fine. It's all about how bad you want it. I was pushed into my destiny. I went from singing background on the Praise team to being a Praise and Worship Leader who is in the process of writing songs, getting the copy written, going in the studio, traveling to Barbados and more...Trust me, when it's in God's will for you to elevate then you will do just that. Just trust Him, and seek Him daily!