If a door closes...
When you want something so bad and no matter how hard you try, it just will not happen for you. You plot and scheme, you put yourself in the right place at the right time and nothing...
You are getting nowhere, despite trying as hard as humanly possible to make it happen.
Eventually you find a loophole, and try a new tactic, still nothing. You are still at the 'banging on the door' phase of this adventure. You haven't yet realized that whatever was behind that door that wasn't meant for you. If it was meant for you, the door would open.
The door has closed and no amount of banging is going to bring you the results you wanted. It's over. This is not a time for a pity party, it's not about you never getting what you want. Try looking at this from a different angle...change your perspective of the situation.
"If you change the way you look at things, the things you look at change." Dr. Wayne Dyer
No one is picking on you, no one is out to get you. Consider the fact that the door was closed because it was time for you to move forward to bigger and better things. You had hung around behind that door for as long as was necessary to learn what you needed to learn and now it is done.
If the door closes, it's not a dead end, it's a fresh start. You are worth more that whatever was on the other side of that door. You are now free to move forward.