Unless I am very much mistaken this is a Shakespearian Sonnet. Feel free to parse as you will. Personally I always go by how well the rhythm works. It feels ok to me even with the headless iamb starting line nine.

Thank you for taking the time to look at my humble verse. It is appreciated. Of course it's a matter of how you read it. The two lines starting "yesterday" are meant to start with heavy stresses. In an otherwise totally iambic line this, I thought, was usually recognised as headless iambs. As I said, it's how you read it, "in MY" is how I read it. It's important, the shame belongs to me, therefor MY is stressed. I don't write to try to fit a standard form exactly as scanned on paper, I right to be read out loud (or at least articulated in the mind). Show me where something does not fit the rhythm and I'll try to resolve it.

Shakespeare Sonnet 154
The little Love-god lying once asleep,
Laid by his side his heart-inflaming brand,
Whilst many nymphs that vowed chaste life to keep,
Came tripping by, but in her maiden hand,
The fairest votary took up that fire,
Which many legions of true hearts had warmed,
And so the general of hot desire,
Was sleeping by a virgin hand disarmed.
This brand she quenched in a cool well by,
Which from Love's fire took heat perpetual,
Growing a bath and healthful remedy,
For men discased, but I my mistress' thrall,
Came there for cure and this by that I prove,
Love's fire heats water, water cools not love.

Parse line 11, does it not start with 3 soft beats?

that is all I ask of any of my poems. If you found yourself stressing the yesterdays, then my writing worked.