Does anyone else have a friendly & not shy toddler??

My 2 year old son will be completely comfortable with a stranger after being with them for only a few minutes & it really bothers me. He's not shy at all. How do I teach him about stranger danger & to not just go up to anyone?? Everywhere we go we're always getting told He's super friendly & not shy at all which can be a bad thing. Which we already know but don't know how to teach him about it since he's only 2.

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