Mine?
I snooped and found out my SO was going to propose on my 20th birthday.
I was so nervous he was going to do it in the restaurant. Because of my social anxiety and everything. He didn't, and it was what I expected from us at the time in our lives, but eh.
Kinda wish i never found out, but still. Whats done is done.
And no, Im not telling y'all how I found out.
Missed opportunities - so many of them for stupid reasons, but especially laziness
I can disguise it as an excuse, but I know it's laziness and not potential rain, "there's always tomorrow," or content to do something requiring no effort (TV or internet nonsense).