Everyone wants a shoe that fits their foot.
What happens when you go to put a shoe on and you realize that it doesn't fit? Do you take it to the counter and purchase it or maybe ask for the same shoe in a different color? The short answer is no, you take them back and ask for the right size and if they don't have your size you go to a different store or find another way to get that shoe.
Life is the same way. When you don't get the promotion, what do you do? When the contract that you've been working on doesn't go through, what do you do? When you don't have the relationship, what do you do? When you loose money on the investment, what do you do?
You don't continue asking for the position, you should take an internal look at what you can do to improve and then make those improvements then work toward the promotion. The short of it is to take a moment to consider "honestly" what works for you or what fits in your life. If the job that you have doesn't fit, while working on that job, start looking for a new one. Also stop complaining about your current job and how painful/challenging/stressful it is for you. Take the step to make a change.
If their is any aspect of your life that doesn't fit, STOP belly-aching, and do something about it. No problem ever got solved from looking. I'm sure you have heard the old saying, "a hungry mouth never got feed". That means that the hungry person needs to do something about it, and talking is not the same as doing.
As my mom would say, less talking more listening, less talking and more working. Shut your mouth and get to work. Time to take the necessary steps and do something.