Each of us has a purpose in life. Some of us see it clearly, some don't. If you are one of those who meet dead-ends as often as you care to count, don't despair. Go back up and continue with your journey. Enjoy the ride. Observe, learn and go on with the same enthusiasm as you first started.
Direct your sights to what you really want your end to be. You will never know when you have arrived if you don't know where you are going.