I'm a lefty that plays righty - thankfully! While I love being a lefty I can't imagine how many awesome guitars I would have been denied had I played lefty. Normally I would say to stay righty and also question your teachers motives in suggesting you 'start over' playing lefty as a way of increasing your time in need of paid instruction. I'm also not sure what your vocals has to do with your guitar playing side-preference, though.
But since you admittedly say it 'never felt right or natural' then I would say absolutely try to learn left-handed. For me, playing righty always DID feel natural to me. I chalk this up to years playing 'air guitar' with a tennis racquet righty! It's also noteworthy that while I do many things left-handed, besides guitar I also golf and bat right-handed. But I play tennis and hockey left-handed. I even set my drum kit up lefty. Go figure.
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