No excuse required! When I write, I may not pick up any little errors; my mind knows what I intended, and my eyes don’t see what I actually wrote.
I automatically proof-read the words of others. For some reason these things jump out at me when I cannot see them in my own work.
Have you tried Grammarly? A free browser add-on that picks up a lot of these things.
And, keep writing! I enjoy your stories.