Naw, when you grow up near the beach and spend alot of time in the water as surfers do you learn to identify what else is in the water really quickly. I was a surfer dude growing up when I lived in Charleston and it was a blast. Having phins around was a good thing, as typically they do not hang around long with sharks in the water, so where there are dolphins there are typically not sharks. Plus, the dolphins would swim right up to the board and you could touch them. I only saw 2 live sharks the 8 or so years that I surfed, one was a white tip and one was a hammerhead.
I will say this though, the current SC state record Tiger shark was caught off a pier in Myrtle Beach, Cherry Point Pier to be exact, a pier that is well known for both its fishing and surfing. The shark was 18 feet long and swimming with the surfers!!!!
Now, we had a ton of cuda back home, but they never bothered us, maybe because we were so much larger in size. Hard to believe, but cudas are fairly goo to eat when grilled, most folks I know consider them to be trash fish because they are so boney.