First Fender Bender ever?

This isn't a gender based question, but really just a "Im young did something stupid and need adult advice question". Had a small fender bender left a small dent however the people I hit escalated the situation by including a gun. I paid them for the damages done but I'm scared of identity theft, doesn't help I lost my ID at a self service car wash. I'm 99%sure the vacuum sucked up my ID. What can I change or handle to protect myself and money?
First Fender Bender ever?
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