Imagine, what if Shu wasn't actually lazy? What if he wasn't actually antisocial. Maybe, Shu was just depressed and wasn't able to do the things he yearned to do because he felt he couldn't accomplish them or do them well enough. Perhaps, Reiji's nagging just added to his heartache. Possibly, Shu was just really shy and awkward. He could just have a huge fear of speaking in front of people.
