Why do people get nervous and clumsy around me?

I feel like i must be doingsomething wrong because most times i go out people get nervous around me and clumsy. Whenever i go to a coffee shop or something like that the waitress usually drops something around me by mistake or does something else clumsy. i'm not complaining or anything i just find it weird that it happens around me s much and not really my friends or anything. Maybe im reading too much into it though I don't know.
Why do people get nervous and clumsy around me?
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