I'll never do that again...

I'm not trying to become a GM. There are times when I blunder more than I make excellent moves. I'm trying to improve and think I should be playing longer games like 30 minutes but I just don't have the time. I do know that at my extremely low level, we should be looking over every move, double checking, what move would my opponent play next, blah, blah, blah. Ten minutes isn't really enough time.
I feel like my opponent is in the same boat.
However, I just played someone and blundered away many of my pieces. I was down 13 points at one point. I made some clever (I think) that caused him to think. I fought back and kind of taken over and he was running. I had 3 or so minutes and he had 30 seconds. I felt like he was destroying me the whole game it's kind of cheap to win on time. So I resigned with him having :02 left so he oils have the win.
Nothing in chat about why I would resign, thanks for being fair or whatever
My whole life I've done things like that. Not anymore. You can't get it done in 10 minutes and you have to lose on time, then you'll lose on time.
Maybe I'm just ranting at myself for not having a killer instinct.

I've done things like that too, but maybe you could have offered a draw instead of taking the complete loss.