When I saw a shark in my for the first time~

I thought I can could survive even if sharks attact attacked me in offshore because I'm a very big and tall guy. Haha but I realized (that) I can't couldn't after I have seen sharks directly. It was huge and looked like the most powerful animal which I have seen. I changed my mind. I can't survive against sharks.

I said this my opinon to my girl friend (when we were at the) in Busan aquarium. She said to me, "Stupid". Hahaha. I agreed with her it's a stupid idea that I thought I can could survive and why (I'm even thinking about that/ why I even think about that).