Acrophobia is serious!  I always get a weird feeling in my stomach when I am up high and look down.  Even when watching videos.
A lot of scientists believe that acrophobia is inborn. Have you felt this way since you were young?
Since I can remember, yes.   I remember being a boy scout and looking out over the edge of cliffs and feeling that way.
My sister is the opposite of you. She has a head for heights - she could dance along a cliff edge, it wouldn't bother her a bit.
Acrophobia
I usually get scared when I'm high up, but it's just a fear of falling. Not full-blown acrophobia.
There are a few videos on youtube of people free climbing with no ropes or anything.  I can barely watch them!
I've seen some of those videos - they're crazy! Couldn't do it.