A mixture of me

I had to be in your life to tell you there is sour
and i had to be in his life to tell him there is sweet
I had to be this once
I had to be that now
I am this
but a bit of that too
Am i open to labels ?
Can i claim to know how to define myself ?
Can i claim to know people ?
Can i bind them in words ?
Can i stand on stable ground ?
Can i ever completely say
Can i ever completely mean
Can i ever truly say - I KNOW ?
Can you ?