your life is beautiful thanks to your beloved in your life. so now suppose if you are indestructible immortal but at the same time the people around you are not. not even the earth moon and the sun.. they have their expiry date. so one day there will be nothing and you will find your self floating in the space and your life would be horribly boring. and if you are lucky to catch an asteroid will land you on other planet but you will find no one over there then again you will wish you could die

That's kind of a sad thought, so I suggest we be positive in the here and now.