Closely resemble me

What I do, what I do,
Is to try and look at myself,
As the other does,
But when I do, when I do, I realise,
What they see is not me,
their eyes are no mirrors,
They are like the sea,
If they are blue, I am blue,
If they are red, I am red,
If they are troubled, I am all blurred
I change with their highs and lows,
But when it's clear I can see through them
Something closely resembling me.