My mom's making me go vegan! Is that healthy?

My mom is a total health nut, and she's making me go vegan. I can't eat/drink ANYTHING from animals, even milk. I was wondering if this is healthy because doesn't milk have vitamins in it that helps your bones to grow? And if I can't eat meat, then that's a lack of protein. I've seen people go vegan before, but even they couldn't handle it and pigged out on McDonald's whenever they got the chance.
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I didn't ask about my mom making me go vegan, I asked is it healthy. I got plenty of great answers, so thanks! (Don't need any mom help, keep your comments to yourself) :)
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Okay.Question rephase, since some people don't get it. MY MOM IS VERY FIRMLY SUGGESTING THAT I GO VEGAN. IS IT HEALTHY?
My mom's making me go vegan! Is that healthy?
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