Hi everyone. I am writing an English sonnet (rhyme scheme: abab cdcd efef gg) for my college english class and I would greatly appreciate some suggestions on how I can improve it (specifically, better word choice and transition). The sonnet is supposed to be in iambic pentameter, which I think I employed correctly but I'm not sure if all the lines are in iambic pentameter. Any suggestions are greatly appreciated! Here it is:

Buzz stands tall against my grey bedroom wall.
His helmet is gone and his paint is thin
But his badass smirk that makes rivals fall
Remains on his pale and big chirpy chin.

All those years leading up to this dull day
When our lives move on, and the memories
Of battles and hardships must fade away.
So I start to cry and drop to my knees

And pray to God for a smooth transition.
I hear the car starting outside the walls
And place Buzz in the box for donation.
No longer can I linger here and stall.

Wait, wait! For am I ready to let go?
Stay, Stay! Join me for one last epic show.