Opinions, please!

I've never written stories before, but had an idea stuck in my head long enough that something had to be done about it. Any critique that will help me improve is appreciated!

Also, is there a preferred site for sharing work? Itch.io technically has a book section, but it really is mainly for games.

It's a short story (<3000 words) about a miserable guy becoming a vampire. It's a little crude, but I tried to keep it humorous.

https://scarypotato.itch.io/glenn-the-unfortunate-vampire