['So I was finally convinced to try rock climbing this weekend for the first time.  I do not like heights at all.', 'Are you nervous about it? Hope it goes well.', 'I am very scared I must admit.  I am sure it will be fine, but I would rather be on the ground.']
Well maybe you should start with a small slope and work your way up. Don't terrify yourself.
I am going to rock climbing for the first time this weekend and I do not like heights