Study up...search GT and the web. There are 'accepted' ways to hold a guitar, but no 'one' way. I use a modified classical position myself as it helps me with my large dreadnaught acoustic. A benefit is that should I stand and play the guitar is in the same position as when I sit and practice. Your issue might simply be strap adjustment. Check out Lisa's and Chris's videos.

Guitar position and posture is important...something I learned way too late.

Have fun!