I learned about what I should do through my lecturer just now.
"Be an productive person !", this is exactly what he said.
Do everything that you can to produce 'something' even the smallest thing counts.
It isn't just an object but an idea too.
Object has tangible form. Therefore, you can keep it.
But an idea, you can forget it. So, give shape to your idea.
Produce 'something' everyday ! It will be your future's savings.
In the end, there is no meaningless thing. Your hardwork will be paid.