How to Know "Where you belong?"

We are always told, stay where you belong, think before you say anything, don't trust anyone so easily, and in the end they give everything a full-stop with phrase "live your life to the fullest". How is that even possible? In such a short life, which is just empowered with all the uncertainties, where would anyone steal the time to think about all this? Isn't it tough? And how everyone is always talking about stay in your limits, it's the crucial moment of the hour to ask these people, what is the definite range of proportions of limits to the human beings, and this will leave them swirled up in their own words.
There's no limit to what a Human being can do, what he can achieve & what he can lose. If left sane after all the back-biting, selfishness, hatred, and many more tough stuff, one can achieve the level of sanity that they can be compared to God, but it's almost impossible to be untouched by the power of seven deadly sins, isn't it? And if once lost to the poker of Life, one can become the sinister, the one who wrecked his path to reach light and now is totally insane. And becoming insane can make you break any kind of barricade which once stopped you from being happy. Now just one path, but you can be two different things, one comparable to God, and one equal to psychopath.
If I know you, and you know me, then why should I think about uttering out bitter truth on your face, and if I don't even know you, then why would I bother to even speak to you. Life is confusing, not at all understandable, and mostly no matter what you achieve it will never give you "happily ever after". Basically, we treat life as a wave of ocean, and in real, it is an ocean, who'll choke you up in its waves, sometime they'll be of happiness, whereas sometimes, they'll just teach you how to swim in rough stream. So, in this life, of if there is any afterwards, we'll never know our place of belonging, we can find happiness, but anywhere we'll go, nothing is there which could satisfy this undying thirst of man to grab everything in its way, when everyone know the destination of this journey is just some crushed bones left.