what belongs to you when you stay alone?

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A passenger of my life had told me:"Every should have something belongs to himself(herself) in the long life....." He told me he can keep practicing calligrapht all day.And every time he felt boring or lonely,calligrapht can always take it off.He never feel lonely when he is writting.At that time,I was busying prepare for the exam,I did not care about it. After I go to colledge,I suddenly understand what he meaned.So I keep searching that thing.In one hand,I really need something belongs to myself,belongs to my heart.In the other hand,I found so many people had that kind of thing,such as some like playing instruments,someone like reading,and some like scale models.And what shock me is that they can do just one thing all day.And I had tried to find something,but always failed.Now I still keep searching.And I keep asking myself the same question. So what's your opinions?What belongs to you in your mind.