对着镜子练习微笑，直到有一个是你觉得舒服和自信的，也许这听起来有点奇怪。
As weird as it sounds, practice smiling in the mirror until you get one that you are comfortable and confident with.
另一个建议是对着镜子练习，我试了一下，可以确定这么做会让人变得更加难为情。
Another is that you practise in front of a mirror, which I've tried and can confirm makes one even more self-conscious than one was feeling already.
多和自己对话，对着镜子练习自己的肢体语言，找出自己的缺点并加以改正。
Talk to yourself and check your body language in the mirror to ascertain your flaws and improve upon them.
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