If I could catch a rainbow

If I could catch a rainbow
I would do it just for you
And share with you its beauty
On the days you are feeling blue
If I could build a mountain
You could call your very own
A place to find serenity
A place to be alone
If I could take your troubles
I would toss them in the sea
But all these things I am finding
Are impossible for me
I cannot build a mountain
Or catch a rainbow fair
But let me be what I know best
A friend that's always there