Do NOT add to losing positions
The key of my problem is that I must not get into situations where the loss will be so big that I won't be able to get out. Yesterday the ZN was losing 300, and I said to myself: if it made sense for my systems to go LONG 300 dollars above, then it will even make more sense for me to go LONG now. And I did. Then, when I was losing 700 dollars, I said: it makes even more sense to go LONG now so let's go LONG a third contract. Now my loss is 1500 dollars, and this situation is typical of how I've blown out my account in the past.
In short, I must not add to losing positions so much that my loss will keep me from getting out of a trade. Now I am ****ed. I know that if I get home, I will add more positions to my trade. And this time, as 90% of the times, it might even work out, but one of these days it will not work out (the martingal method) and my account will be wiped out, as 30 times before.
If ZN doesn't go up in the next 10 hours, I will have to take this 1500 dollars loss, or even bigger maybe. I suck.