I had the exact same problem. I felt incredibly comfortable on right handers and felt nervous on left handers which caused me to have more problems. The three things that I realized that cause this. I wasn't looking far enough through the turn which hurt my confidence and sped things up. Remember to look through as far through the turn, it takes some practice, but with time you'll be able to look through the corner and maintain good corner positioning with your peripheral vision. Second thing, when you go right you can easily relax your left hand because you are using right hand to throttle, but when you go left, you have to use your left to counter steer but maintain your throttle hand so it's easy to be too firm with the throttle hand which makes it feel harder to go through the corner going left. Relax your arms and make sure they are loose. That really helped me going left and right also, but more so left. And the final thing I noticed when I struggled left was my body positioning. I was able to get a comfortable riding position through right corners which gave me extra confidence in case of a road hazard I could get lower or maneuver quickly, but going left, I struggled getting into the correct body position, so I didn't feel that same escape position in case something happened. Changing those three things for me allowed me to feel much more confident going left.