I toss you around and make you think.
I stress you out but I don't blink.
I'm not a person or a thing.
Who am I?

I may be complicated or simple.
I am hated and loved.
I am beautiful yet threatening.
Who am I?

One might define me as a journey.
I can last seconds or years.
Happiness and hurt come with me.
Who am I?

I am *life.