How do you effectively avoid getting an STD if all it takes is shaking someone's hand to get one?

Update: like what if they scratched their crotch then shook my hands when i didnt know what they did before and I had a cut on my hand somewhere and how much of chance could i get an STD in my cut on my hand? i thought i read somewhere that theres a non-zero chance of that sort of thing happening where you dont even need... show more like what if they scratched their crotch then shook my hands when i didnt know what they did before and I had a cut on my hand somewhere and how much of chance could i get an STD in my cut on my hand?
i thought i read somewhere that theres a non-zero chance of that sort of thing happening where you dont even need to have sex just like shaking hands or something
Update 2: i dont have a partner and have never had sex im a virgin and im 21
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