There is no God. There is only reality, and nature. they are
governed by physical laws, biological laws, sociological cause and
effects.
there is also one thing called cognitive bias, which are the common
errors make by human mind when perceving, thinking and reasoning
things. Go read up on philosophy, psychology if you want to upgrade
your brain.
in reality, everything has its reasons, complexity and causality.
it is only the ignorance of mind and the emotions of your body that
you do not know that create your problems.
and regards to your problem, you are just complaining. look you
have eyes right? Some people are blind! do you feel angry for them
that they are so unfortunate and do you feel grateful that you are
not so unlucky.
Look, the reality is this. Look at how big the universe is. Look at
how small a human is compared to universe. Of course this means
that there are many things not under our control.
Unlucky things happen to you?? have you learn what is
Chance/probability in maths lesson? That is reality, if bad things
happen to you, it happens to you. the solution is to accept the
fact. If you are fearful and angry when bad things happen to you,
you are not accepting the fact. If you cannot accept reality, you
will only be angry for the rest of your life.
So start cultivating a calm and no desire life and build good
attitude, personality and behavior in your life.