How to get out of depression and love life again?

I really loved life until i become 15. But for the last 15 years, I am always depressed and hate life. All i wanna do is lying in bed and waiting to die. Feels like i am in the grave. Hate to dress new or good things, always feel tired and sleepy, don't want to see any human.

How to get out of depression and love life again?
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