what does life mean?

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these days i always thinking about one question, what life really means? now i am a student in a graduate university ,though i have many classes every day at evenings and weekends i always free and i do not kown what i should do? sometimes i read some books on philosopher ,classic masterpieces ,watch movies ,tvs and play some games.but when i need to read some articles ,my interesting is also disappearing,i really reget about this.so when i did something else ,i always think about my articles,a terrible mood would come,what i should do? i want to take exercises but i can not find somebody come up with me,so even i like sports but i do not often exercise ,it may be terrible,too.