I'm a beginner lefty and recently bought myself a left-handed acoustic guitar. For me the choice was clear and feels absolutely right as I've been learning, although I can't exactly tell you why:) Partly, perhaps, in the ability to keep better strumming rhythm with my left hand.
Each person needs to choose for themselves and see how a real lefty guitar feels to hold and play compared to a right-handed one. Some can go either way and some of us just can't get our brains to work any other way than strictly left-handed.
Using GT hasn't been a problem because learning from a mirror image might actually make some things easier. I wold appreciate some lefty acknowledgement somewhere on the site, though, for example in the form of chord charts. Luckily these can be found elsewhere online.
All the best in making your choice!