As much as you want everything to turn out as you want it to, that is not always the case. You have to accept that some things will not end up like you want them to and move on. Feel free to vent if that makes you happy, so long as you warn somebody before doing so to avoid insulting anyone. Or, you can calmly tell yourself that everything will be okay and what you are going through is a small bump in the road. Keep encouraging yourself and you will start to feel better in no time and move on to your next task.  
    Things don't happen overnight 
     Just flow the flow of life 
     Take a look at the big picture 
     Be patient and tough - someday this pain will be useful to you 
     Nature does not hurry, yet everything is accomplished 
     Patience and fortitude conquer all things 
     With love and patience, nothing is impossible 
     Just keep going when it’s tough. Just keep going when it’s long 
     A man who is a master of patience is master of everything else 
     Patience is not passive, on the contrary, it is concentrated strength 
     You usually have to wait for that which is worth waiting for 
     Patience is bitter, but its fruit is sweet 
     All human wisdom is summed up in two words – wait and hope 
     Don’t cross the bridge until you come to it 
     Rivers know this: there is no hurry. You shall get there some day 
     Slow and steady wins the race 
     Do not pray for an easy life, pray for the strength to endure a difficult one 
     Come what may, all bad fortune is to be conquered by endurance 
     Patience is the key to contentment 
     One moment of patience may ward off great disaster. One moment of impatience may ruin a whole life 
     Trees that are slow to grow bear the best fruit 
     There is something good in all seeming failures. You are not to see that now. Time will reveal it. Be patient 
     Change is slow and gradual. It requires hard work, a bit of luck, a fair amount of self-sacrifice, and a lot of patience 
     Maybe that’s why life is so precious. No rewind or fast forward… just patience and faith 
     Our patience will achieve more than our force 
     Who ever is out of patience is out of possession of their soul 
     Patience is waiting. Not passively waiting. That is laziness. But to keep going when the going is hard and slow – that is patience