I need some help and assurance with what has transpired up until now?

Of course Allah SWT knew you wanted to be a pilot, however, Allah SWT also always knows best. Perhaps if you became a pilot you would crash, or someone with a bomb strapped to themselves would kill everyone. Or something less drastic could happen, maybe being a pilot wouldn't bring you the joy and self fulfillment you think it would bring you, or you miss out on an opportunity that would bring you more joy and happiness. And don't worry everyone has their low points of Iman (faith) but just trust that something better will come out of this.