on one occasion in a casino I did the martingale strategy wrong and I stayed at zero, the truth is that day I felt bad about myself, but it was because I couldn't contain myself or control myself, suddenly I started betting like crazy and I didn't see what I was betting, I lost pro carelessly and by misusing that strategy, to do that technique I would do it very carefully
This is why it's always recommended to use a bot or choose a game with advanced auto-bet feature when you want to apply a strategy. This way you will be sure you won't make any mistakes and won't be affected by your emotions. Just make sure to feed the bot with the correct settings and data. This will save you a lot of time and effort too.
Bear in mind, this doesn't mean you will have better chances of winning or make the strategy work. The odds remain the same.