Shakesphere extended conceit?

Question

I cannot figure out the extended methaphor in this passage.

Now I am alone.
O, what a rogue and peasant slave am I!
Is it not monstrous that this player here,
But in a fiction, in a dream of passion,
Could force his soul so to his own conceit
That from her working all his visage wann'd,
Tears in his eyes, distraction in's aspect,
A broken voice, and his whole function suiting
With forms to his conceit? and all for nothing!
For Hecuba!
What's Hecuba to him, or he to Hecuba,
That he should weep for her? What would he do,
Had he the motive and the cue for passion
That I have? He would drown the stage with tears
And cleave the general ear with horrid speech,
Make mad the guilty and appal the free,
Confound the ignorant, and amaze indeed
The very faculties of eyes and ears. Yet I,
A dull and muddy-mettled rascal, peak,
Like John-a-dreams, unpregnant of my cause,

If i could get any clues or any help i would greatly appreciate it ! Thanks

Answer 1

My take on this is that the speaker is sorrowfully contrasting the high skills of an actor to express emotions which are not sincere with the skills of an ordinary man who struggles to express his genuine emotions.

Answer 2

I think "keypointist" has got it exactly right and he's far more articulate than I could ever be. "O, what a rogue and peasant slave am I!"