Greets, In_The_Darkness!
Personal Opinion (possibly flawed): Yes, nice people do exist in the world; finding and engaging them, however, can be difficult.

I don't blame you at all for losing the will to try with people. Having reached the limits of your energies, perhaps it's time for a rest. Anyway, it is my experience (here's where I might sound like a broken record - I guess that phrase dates me) many of the best things in life, companionship among them, come to us when we're not looking for them.