How do I ask someone not to touch me?

It’s awkward at times. Especially when I’m out eating alone a lot of times waitresses will put their hand on my shoulder. It’s awkward and I usually move a little. Sometimes they just keep their hand there.

It’s also just people random people who talk to me and start touching me. I don’t want to be rude. But how can I tell them not to touch me

How do I ask someone not to touch me?
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