I'll never do

Last year, I went to the Universal studio Japan, amusement park on Osaka.
Actually, I hate high place.
So I have never ride roller coaster as I think it must scary.
However, my friend said "It is very fun!! You are MOTTAINAI not to ride roller coaster."
I decided to ride it.
After ridding, I deeply regret to ride.
It was seriously scary.
My blood was floating in the air...

So I decided I will never ride roller coaster or never fall from high place.