I used to worry and freak out about things that happened to me, about why I God put me in certain situations, and other questions like those. These were questions that I asked God; questions that began with the word "why". I should know better than to ask God "Why?", cause He is in complete control of my life.
And we know that for those who love God all things work together for good, for those who are called according to His purpose--Romans 8:28
This verse (in particular) has helped me to stop asking God "why?", and trust Him with every area and detail of my life. Cause I know that He is with me always, and that nothing separate me from Him!