I remember this well - it occurred about a month before I shipped off to boot camp.
Two years later I was stationed in Manhattan and visited the World Trade Center. I could not then nor can I now comprehend how anyone could accomplish such a feat (much less desire to do so).
To say I don't do well with heights is an understatement but while there I went to the roof anyway. Doing so did nothing to alleviate my phobia but looking back, I'm glad I went.