We are only ever born with 2 fears, the fear of falling and the fear of loud noises, everything else has been learned.
A phobia is something that you intellectually know poses very little or moderate risk, however you react as if your life is in imminent and mortal danger and it can be utterly life constraining.
I can help you overcome your fear and you could be permanently rid of your phobia in as little as 3 sessions.