In Othello's soliloquy in Act 3, Scene iii, how does he suspect that his age, lack of sophisication, and skin color have affected his situation.

After Iago plants seeds of doubt in Othello concerning his
beloved Desdemona's faithfulness, Othello begins to reason out why she would or could
possibly be unfaithful. He mentions that he is black. He also states that he does not
have a softness in his conversations as gentlemen have. He feels he is getting older.
All of these distinctions become reasons in his mind as to why Desdemona would be
unfaithful.

No doubt, Iago has done major damage in
Othello's mind and heart. Othello cannot or does not want to believe his Desdemona could
have been unfaithful. There must be a good reason, thus he lists them in his soliloquy:

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OTHELLO 

This fellow's of
exceeding honesty, 
And knows all qualities, with a learned
spirit, 
Of human dealings. If I do prove her haggard, 
Though that
her jesses were my dear heartstrings,
I'ld whistle her off and let her down
the wind, 
To pray at fortune. Haply, for I am black 
And have not
those soft parts of conversation 
That chamberers have, or for I am declined

Into the vale of years,--yet that's not much-- 
She's gone. I am
abused; and my relief 
Must be to loathe her. O curse of
marriage, 
That we can call these delicate creatures ours, 
And not
their appetites! I had rather be a toad, 
And live upon the vapour of a
dungeon, 
Than keep a corner in the thing I love 
For others' uses.
Yet, 'tis the plague of great ones;
Prerogatived are they less than the
base; 
'Tis destiny unshunnable, like death:
Even then this forked
plague is fated to us 
When we do quicken. Desdemona
comes:

Whatever the reason,
Othello is beginning to believe his Desdemona could have been unfaithful to him. In the
above soliloquy, he determines that she could have been unfaithful for a number of
reasons.