How should you eat if you're on a diet and your friends aren't?

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For two months now I've been regularly exercising. And all exercise will be futile if you don't control what you eat. At least that's what I've gleaned from various sources across the net. So I've gone from white bread to wheat bread, drank minimal soda ( a big feat for me trust me) and shifted from a high carb diet to protein inclined diet (turbo fire people). I'm from Asia, with rice as staple food so that really is something weird for most of my peers and more so for my very vocal friends. I'm not obsessing. I'm just choosing a healthier lifestyle. The problem is, most of my friends have different thoughts about my new lifestyle. For sometime now, I've been dreading eating out with friends because I can't seem to convince them that I'm really (really,really,really no matter how much I'm drooling) not into unhealthy food right now. I'm feeling the effects of my diet and regular exercise. I'm way more alert these days. I have the "energy" for the first time in my life. I'm afraid I'll fall back to the old me just to make my friends like me (and stop pestering me about what I eat). I realize that there should be a question here somewhere.