I have a real problem with studing

I used to be a good student, but after working for 5 years I didn't find much use for what I have studied. I still love CS very much, but something feels wrong, I don't have a peaceful mind for studying as I used to, I can't see any hopeful outcome or even meaning from studying again. I feel like the world is messing with me, making me angry and scared at the same time. Sorry to bother. [Excuse my English, I am not a native English speaker]