When you say "narrow lane" I hear "there's not enough room in the lane for a car to pass me on my bicycle." If that's the case, you have two choices.
1: Get off the road. Maybe you can get back on the road for as long as there are no cars coming, but you have to get off the road when one comes. Not particularly viable if there's a ditch, rock face, or dropoff.
2. Take the lane. Traffic behind you can wait until it's safe to pass.