All is not as you always have believed in...

And when you discover that it's just like someone take all air out of your lungs or take away the piece of the ground that is right under you in that moment. You fall down in the underground deep down where all is nothing but dark. You look for some matches to light up with but don't find any. All you have is this big dark around you.
That is what happened to me today.
I don't know, maybe I have too good thoughts about other people and that makes me to a big fool when I discover it's not like that.
Maybe I am a big fool when I believe in other people ?
I hate to feel disappointed when I am already feeling low. Why did this have to happen now ?