Why am i so scared of heights? how can i get over this irrational fear?

Phobia: A phobia is an irrational or excessive fear of something (heights) that causes significant distress and interferes with a persons ability to function. Many reasons may be linked to your fear, but figuring out the why is less inportant than confronting it head on. The best way to do this is with a licensed professional who can guide you thru the process of systematic desensitization.

Your options: As a skydiver, I've seen people confront this fear head-on by making a parachute jump (with supervision, of course). Nothing succeeds like proving to yourself that you can be brave by acting brave. Just my experience. Best wishes.

CBT: Seek a cognitive-behavioral therapist who specializes in phobias. One method they use is systematic desensitization which slowly and incrementally brings the person closer and closer to the thing they are afraid of in slow, graduated steps that help make the anxiety more tolerable.