Being left handed doesn't pose any problem as far as I know. I'm a lefty myself and haven't had any difficulties with learning guitar on GT. It actually made it easier for me to learn from right-handed people since I can instantly mirror it.
Anyway, check out this topic where I and a lot of other people answered the same question: https://www.guitartricks.com/forum/showthread.php?t=38434&highlight=left+handed
Kind regards,
JJ