Analysis of Fibro warrior

Some days life seems hard,
Others merely long,
Sometimes I feel life's a joke,
Where everything goes wrong.
Some days it seems I'm happy,
Though rarely this is true.
I just keep my feelings to myself,
There's no need to bother you.
Some days are a struggle,
And though strong as I may be,
You cannot see the inner fight,
That rages constantly.
Some days I may seem normal,
Like anyone you know,
But normal is a mask I have,
That is regularly on show.
So do not doubt the pain I feel
It never goes away,
Pain and torment live inside
I fight them every day.