Do you want to learn how to overcome fear of roller coasters? Ok!
Do not look down.
Do not sit on the front or back. Since you are going to be high in the "space" sit between people, assuring yourself that since others a safe, so you are.
As you get used to this...you are going to find yourself bolder and assured than before.
Do not listen your feelings or the tingling sensation in your stomach (that's fear) focus on the safe reality.
Hold on tight and believe your grip.
Go with a friend, a bold one. Doing things in pears motivates you to be better instead of worrying about the risk of failing.
When you couldn't find a solution to overcome your fear of roller coasters, scream while driving. It helps shake away doubts and turns your fears into fun and lovely adoptable.
Do not think about movies, you are in a real world. Believe what real people beside you do. Progress and failure.