This was excellent. Sharp, a little creepy, a clear narrative. I look forward to the next installment.

I have a couple nit-picky things for you:

1) I think you left some words out or got something twisted around where you first talk about ideas vs. inspiration
2) I found it jarring to hear the narrator to use the words "ragged on" and "asshole". People might say those words, but they seemed really low-brow for the tone you had established for the narrator, especially for a narrator who is amplifying the thoughts of a guy who calls the mail man "sir".
3) This doesn't seem like a guy who'd use a gun to whack himself. To me, he's got sleeping pills written all over him.