sharks

so i’m in cape cod and i’m taking a surf lesson but there is a lot of sharks in the water this season and people suggest not doing it. We don’t go very far out bc i’m a beginner but i still am very scared. I also am very late on my period so idk if i going to get it without knowing and like what if a shark smells it if it does happen. The lesson is also on the national sea shore so there could be a lot of sharks. Is it a good idea?