It's a worst mistake if you will all-in what you've got. And committing this mistake twice is too much just like the saying that once is enough, twice is too much. You committed that 3 times in your life and I'm sure that you are still insist to do that if there are chance when you'll on that situation. I don't want to try it again when I just feel that I'm lucky to gamble, it's better to bet safely.
Going all in is not a mistake but going all in when you have almost no money left is a serious mistake. I know few guy that bet their monthly allowance all in just so that they could cover some fee to paid but they ended up losing it. When someone needs serious amount of money in real life, he will then probably bet more and make stupid mistake in gambling