What is fear? In its simplest definition, it is faith in the enemy. One of the most insightful quotes I ever heard on fear came from "Point Break"...
"Fear causes hesitation, and hesitation will cause your worst nightmares to come true." I never heard it said better. I'm not saying you should just go jump off a building, because once you hit the pavement, you will die if you're lucky (if not, you'll be in torturous pain and awaiting a prison sentence, since attempted suicide is a crime). Respect the realistic dangers, but if there is nothing but a "what if" to fear, then focus on "what IS" and deal with it.
Fear is also black magic. It attracts bad luck to you. Honestly, look around you. Look at all of the people around you who are constantly afraid of things, and look at how much goes wrong in their lives. There is a connection. Fear is a magnet for the things you fear most. Without it, bad things will still happen to you, but at least not as often. Just accept what happens and don't worry over the "what ifs". The things you do will make your future what it is. If you build your defenses, you will be attacked. If you fear something, it only makes it more likely to happen. If you trudge ahead, ignoring the fears, they will usually be much easier to tackle. Believe in yourself, and act on what you want, because opportunity passes us all; some of us just grab hold and enjoy the ride.