I'd like to join Petal22 in welcoming you and reinforcing what was said, it's true we all make mistakes, some trivial, some larger. It's part of being human and yes - we can learn from them.
There are obvious things like not hurrying or trying to do to many things at ones, using a calculator or spreadsheet rather then mental arithmetic -and so on.
it can go further and seeking advice about a particular problem (as you are doing here).
I suppose I'd like to ask two questions if you did not mind.
The first is pretty obvious, is there some sort of reason why you make these mistakes? Overwork or a physical thing like a crowded noisy office or a mental thing hard concepts to grasp?
The other question is about your thread title were you imply you self-sabotage. Do you really think you go out of your way to make yourself look bad or perform badly, or was that just a throw-away phrase?
I remember as I became more and more anxious at work I'd make more and more mistakes - ironic really, I tried harder and harder, and ended up making things worse and worse. I even got to the stage where I'd spend so long getting one task perfect I'd simply not do others due pt lack of time.
I would like it if you came back and said what you thought.