How can I force myself to sleep in any other position besides on my right side?

Every morning when I wake up, my right side of my face looks tired, and my left side doesn’t. This is because I sleep on my right side. No matter what I do, I wake up on my right side. How can I force myself to sleep on my back or on the left side? 10 years from now I don’t want my right eye to look more aged than my left eye. If they are both the same, that’s fine… but I don’t like uneven things, especially aging on my face.