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how come Allah swt created some people healthy and some not? some has big problems, rough days, some live easily? is Allah unjust??

Allah jawab dalam surah An-Nisa ayat 40.
40. Allah is never unjust in the least degree: If there is any good (done), He doubleth it, and giveth from His own presence a great reward.

this is a test! Allah test different people different way.
any calamity comes, it's either a test or a punishment.
and any good things come, it's also either a reward or a test for u.

and many times we human beings complain to Allah, why are u not answering my prayers?? but in fact Allah says u ask Me and I'll answer your prayer. but u're praying everyday and Allah is not answering.it sounds contradicting kan? we keep on praying but nothing happens. Allah says in surah al-Baqarah ayat 216,“Boleh jadi kamu membenci sesuatu, padahal ia amat baik bagimu, dan boleh jadi (pula) kamu menyukai sesuatu, padahal ia amat buruk bagimu; Allah mengetahui, sedang kamu tidak mengetahui.” so maybe by not answering, Allah is actually answering u. We dont know things that He knows. so we should never despair, trust Allah. He's there, always there for u.

that's why suicide is haram in Islam. Allah says in Surah an-Nisa, kill not yourself because Allah is most forgiving. the moment someone kills himself, it's as though he's ungrateful. in surah Baqarah again, Allah says, he shall not burden someone greater than what he can bear, and pray Lay not on us a burden greater than we have strength to bear.

in the 1st paragraph Allah has already promised that He wont give us burden that we cant bear, but why in 2nd paragraph he asks us to make doa to not lay burden more than we can bear?? because WE DIG UP OUR OWN GRAVE. WE LAY BURDEN GREATER THAN WHAT WE CAN BEAR. WE ARE THE CAUSE. so we make doa to ask Allah to make us not the cause to lay burden on ourselves greater than we can bear.