What to do when dreams are crushed?

Everybody dreams of something. My first dream was to become an astronaut that was when I was in 3rd or 4th. Then I wanted to ...well I better not tell that coz it still hurts a little because its ok if u try n are unsuccessful but not being allowed to even talk about it leave try for it is painful. Anyways as I was saying everybody has some dreams. My latest dream was to become an engineer n I am almost one (well not in the true sense still maybe! but still !).So what happens when your dreams come crashing down, one way is to work even harder, put in all your efforts n give it another push, or else mop around each day of your life cursing God for always targeting u, n not loving u enough (I know this option is a lot easier than the previous but its plain stupidity).
So people who have loved your dreams and lost always remember you can treasure your dreams for life, but remember don’t bound yourself too tight because you are free to dream new dreams!