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I originally went at 22 and my parents were the same. Their only reaction when I told them my plans were "well, we can't stop you from going". They're going to worry no matter what, I don't think anything you could say would stop them. That's what parents do, I guess! Maybe just send them as much information as you can about the gym/area you're going to (posts, photos, reviews from others who've trained there), so they can at least visualize where you'll be instead of conjuring up some wild scenarious in their heads. Enjoy your month in Thailand, you'll have a great time!