Is it normal I wanna jump everytime I'm on a brigde?

I'm the same way! I also get this way when I'm on tall buildings. A few years ago, I went to the empire state building and I got this intense urge to jump off. I actually went so far as to grab onto the fence and tried to climb it. It didn't get anywhere, but I just wished that the fence would detach itself from the building and I'd just fall off. Another time, I nearly jumped off a bridge with an acquaintance of mine. This urge seems to happen regardless if I'm feeling suicidal or not and the really strange thing is that I'm afraid of heights O_0