There once lived a man who felt like being nothing

There once lived a man who felt like being nothing. He couldn't find any sense in his existence. He read thousands of books trying to find the answer for his numerous questions. But no reference book was able to spray some light to his useless struggle. He almost gave up his attempts when one day he was presented a t-shirt. He read what was written on its back. It said: "Never mind". And that was it.