At first:
All you ever really wanted
Was to get back to your own time
Was to get back to your old life
This whole adventure thing was mad
This whole companion thing was dangerous
You didn't like the old man
The man who had stolen you
Away from your home and your job and your life
You couldn't stand being anywhere near him
He tricked and bamboozled and lied to get his way
He would not take no for an answer
Unless that was the answer he was looking for
He was as stubborn as an ass
He was as childish as a two year old
Throwing tantrums when he didn't get his way
But then:
Something happened and you don't know
What it was exactly
All you know is that something changed
Suddenly, you couldn't think of any other life
There was not anything else when the Doctor was concerned
The TARDIS had become your home
Saving the universe; running an awful lot; and exploring was your job
Traveling was your life
You could not imagine anything else had ever existed for you
Oh, you remembered all right
But the memories that came before the TARDIS
Those were nothing compared to the life you now lived
With Barbara and Susan and even that crotchety, old Doctor
It was perfect and you thought you'd never leave
Until:
She was gone
The entire reason that you and Barbara got to be on the TARDIS
She was gone
Left by the Doctor on a future version of Earth
With a man none of you had really gotten to know
Of course, you were furious
But, the Doctor was old
The Doctor had given up his family
His granddaughter
His Susan
And now you were feeling a mix of pity
And rage, all directed towards the elderly mad man
You wanted to go back to your old life again
But, Barbara didn't want to leave the Doctor alone
And that lunatic's piloting had not gotten any better
Finally:
The Doctor met Vicki
And, you knew that,
If you were ever lucky enough to land
Back on Earth
Sometime around 1963
It didn't matter where, just as long as it was good old Terrafirma
That would be where you and Barbara got off
You would both leave
Knowing so much more
Risking so much more
Living so much more
And,
All because you met him,
Understanding that he would always be in good hands
Because, you and Barbara,
You were the Doctor's first humans