Gradual exposure therapy. Something must of happened when you were young. When you go outside try not to focus on the bad memories or imagery in your head but to focus on positive things and e you are going. Easier said then done but one step at a time and I guarantee you will overcome this fear. You can also use self hypnosis to give yourself positive affirmations. Goodluck
quotes I like
"Winners never quit, quitters never win"
"Life is what you make it"
"What doesn't kill you only makes you stronger"
"Prepare for the worst, expect the best"
"Don't ever let someone bully you into silence"
"Usually when people are sad, they don't do anything" "They just cry over their condition. But when they" get angry, they bring about a change."
"The first step to getting the things you want out of life is this: Decide what you want"
Take it for what it's worth.