Well this is where your personality it self has a great effect on how your thougth process works.
I personally since i was very small learned to look at things in a realistic way, i am now a critical thinker, confident, albeit introverted, but i try to see my problem with every perspective i find possible.
Heck if i cant even considerate a problem i dont worry about it.
Now ive met many people who i have been interested in but i cant have for several reasons, and i look at the problem and possible solutions..thats what you should do but of course its easier said than done..
For example i have a friend who is cute, caring, charming, not rude, pretty, and shes not someone who sucks the life out of you and puts others down to feel better. She's like me, she treats people with a certain type of respect, and analyzes things, but can be the biggest asshole of them all if needed..
She looked like a great catch, but she has a boyfriend who shes very strong with..So such a great package that i am close to but i cant have it..Does that mean i weep about it...No because that would be putting my self down...am i scared of pain to a point where i am delusional? ..no..but i do whats possible to prevent my self from feeling bad when i dont have to..my personality is built like this and thus.. i cant even remember the last time i really got MAD about something, or depressed...or even cried..( for something tangible like this anyways )
So...try to look at things from a perspective where you get to understand whats happening and try to find a way to make sure that whatever the problem, you dont feel bad, and critically thinking find a solution...