Can people tell tour nervous by looking at your face ?

Can you tell when someones nervous by lookig at their face besides turning red , any other ?
Because I'm very shy and when j get nervous around people by face starts shaking but when I speak my voice does not tremble lol I just want to know because I try to appear confident in certain situations but doesn't work . i don't want people to notice my face trembling or w.e ugh . Thanks to everyone in advance !!
 
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