William Watson - The Mock Self

Few friends are mine, though many wights there be
Who, meeting oft a phantasm that makes claim
To be myself, and hath my face and name,
And whose thin fraud I wink at privily,
Account this light impostor very me.
What boots it undeceive them, and proclaim
Myself myself, and whelm this cheat with shame?
I care not, so he leave my true self free,
Impose not on me also; but alas!
I too, at fault, bewildered, sometimes take
Him for myself, and far from mine own sight,
Torpid, indifferent, doth mine own self pass;
And yet anon leaps suddenly awake,
And spurns the gibbering mime into the night.

William Watson

http://www.poemhunter.com/poem/the-mock-self/