My first inclination was to write the below:
Snorkeling is the aquatic version of, "I'll just put it a little way in"...
I know, snark, not shark, central...so I deleted it.
To borrow a turn of phrase from the airline industry, you are more likely to get hurt driving to the snorkel that you are snorkeling. I know that doesn't help, but the world wide numbers are easy to digest, as are Florida's:
https://www.floridamuseum.ufl.edu/shark-attacks/yearly-worldwide-summary/
Now, that said, a little concern is good. This should help: