beforehand my mom had told me not to get in the water
Why didn't she want you to get in the water?
I was super scared because I thought I'd be drowned, but I went in anyway.
It's good to respect what your parents tell you. Sometimes they can foresee danger that you are not aware of.
You don't have to lecture me. I should be allowed to play in the water if I wanted to. Besides, there was no sharks in it
I understand that you want to be independent and make these decisions on your own. I think that it is important to listen to your mother though. She is going to know what is best for you.