Pain stalker

I think that no one loves me
As i stand here in the pouring rain
But then i suddenly realize
That i am loved by pain

I follows me around like a stalker
Never leaving me in peace
Waiting ready to strike
And for my life to cease

No one day goes by without it
As it refuses to leave
It acts pure and unharmful
But its only trying to deceive

It's there when you feel happy
But then it makes you sad
It's there when you feel good
But then it makes you feel bad

But i suppose without it
You wouldn't know pleasure
So it makes it important
Something to treasure?