That's an assumption on your part, one which is unsubstantiated. Be that as it may, one need not "blow out" his account in order to be a failing trader. If that were true, one could not continue to be a failing trader for as many years as so many do. Remember also that many failing traders won't or can't admit to themselves that they are failing traders.
The OP is obviously a troll or has some other agenda. He signed up two days ago and already has 80 posts. A normal person who fit his self described background (4 years of failed trading), would most likely lurk for awhile and try to soak in some knowledge in an attempt to figure out why his method was failing.
Everyone is built differently. One reason may be that you don't have the personality for trading. When we feel stressed, there's a primal part of our brains hardwired for emotional decision-making called the Amygdala. It can override any rational thinking, especially when it comes down to making quick decisions, such as in trading.
Most people pose the question this way: Are you consistently profitable? I am profitable, but not consistently. However, I don't need to make money every month. I just need to make money overall, and save some of it during the up months for use during the down months. Simple budgeting. You need a plan you believe in. If you don't believe in it, you won't follow it. As Faith says, backtesting is what we do because there are really no alternatives. Backtest it till you believe in it. If you cannot believe in it, you must find a different method, and backtest that one. Once you have a method, you must trade at a level you can sustain through thick and thin. If you have a losing day, week, month, or whatever the time period of interest is, you must be able to go back and apply the same method again, using the same percentage of your account. If you are psychologically unable to do that, you are either trading too large a proportion of your account or you do not believe in your method.