I'm always going on about what a great relationship hubby and I have, but I'd be lying if I said we didn't annoy each other now and again.
I have two thoughts on being annoying and suitability for each other
1. Don't sweat the small stuff. If the annoying thing really isn't a problem in the grand scheme of things, it's wise for both partners to let it go. Nit-picking and fighting about stupid stuff will only wear your relationship down
2. Differentiate between regular annoying stuff and things which really are important issues. Her forgetting to return her cup to the kitchen is annoying. But if she does things which are really problematic to you, then you have to question if you're a good match.
If you want more help, tell us some of the things which bother you.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.