(CNN) A Florida surfer didn't realize just how many sharks were swimming around him until he recorded drone video over the beach.

Jeremy Johnston, 33, told CNN he was already nervous when he went to get in to water at New Smyrna Beach on Tuesday because he noticed a bunch of fishermen in the area.

"But the weather and waves were really great so I decided to go for it," he said. "I ran out and jumped on my board when I got to shin-deep water and paddled super [shallow] with just my hands, because I was scared of how many sharks were there."

He said he only surfed for just a little bit before getting out of the water and launched his drone.

At times in the video, a dozen sharks can be seen in the shallow water.