Who am I ?

Who am I ?

I will always be with you in your moment of need
Shall stop you  eating extras
So that it won’t turn to greed
I can hear your secrets though
I haven’t been told
Will compliment your wrinkles
They are laughter lines, not old

Simply ask for advice, I will answer with truth
You can rely on my wisdom
I will never treat you aloof
There is no other person
As caring as me
Just think very hard,
Wonder who I can be

In times of great danger
I will steer you away
I shall do my utmost 
Keeping you safe from affray
You may try hard to find me
But will never succeed
I do not have an image
Yet you know me indeed

Ask me a question, let me ponder for a while
Then I will give you your answer
You will thank me with a smile
No one will ever know me quite like you
Sometimes I know yourself
Much better than you

I may say you are tired
Its time to lay down your head
There are times you ignore me
You do the opposite instead
But that is a mistake
As you always find out
I am your only solution
Giving you no self doubt
Tho this riddle is a challenge
You have left me no choice
But to tell you my identity
I am your inner voice