I'm going to disagree with everyone else here and say you should push yourself out of your comfort zone and try for a leading role. Or at least a supporting role. Even an understudy is better than fading into the background.
Unless, of course, you have no talent. Then in the ensemble you must stay.
But speaking as someone who's been relegated to the background all his life and longs for the limelight, I say take the opportunities while you still can.