Just because

Why is it that you are doing what you are in your life right now?

Is it because you have nothing to lose and everything to gain? 

Is it because your life is a comforting routine and you're a creature of habit? 

Is it because you're attempting to impress someone?

Is it because you aim to prove your abilities to yourself?

Is it because you've fallen in love?

Is it because you're running away from something out of fear?

Is it because you crave new things or the opportunity came and you need money?

Perhaps you could find no other work or appealing ways to spend your time? 

Then again, maybe you work toward a goal and this experience is part of your journey?  Rest assured.  Purpose exists.  It's up to you to find it, accept or reject it.