You will find that if you move over close to the shoulder (or road edge), then cars will pass by you very closely. They see you way over on the right and think "I can get through that space." They see your position as allowing them to take the lane from you.

You need to ride the "Right Track". That is, ride on the track that the auto's right tire would make. You will find that most autos will then wait behind you until it is safe to pass and then will move all the way into the other lane to do so. When you want to tell the autos to not pass you at all, ride the left track.

I usually ride the left track when no cars are behind me. When I see a car in my mirror, I wait until just before they slow down, I look over my shoulder at them (this lets them know that I see them), then if it is safe to pass, I move over to the right track. This communicates to them I see you and it’s OK to pass. In order to pass they have to cross the center line. Since they must go partially over the line, most drivers go all the way over and change lanes to pass – giving you lots of room. If it’s not safe to pass, I hold the left track and signal to them to wait. As soon as it is safe, I move over and tell them to go. As they pass I wave a thanks.

Remember, you are a vehicle. Ride like a vehicle. Take control of the road. Be predictable. Signal you intentions. Drivers will understand what you are doing and will treat you more safely.