Many traders struggle for years, blaming 'the psychology of trading' or lack of discipline, when they've received the "Kiss of Death"
The truth of the matter is that every day you trade, you're training yourself for future trading.
The question them becomes, "Are you being conscious about it and practicing good trading or bad?"
What kind of training are you giving yourself for who you will become in the future?
For most traders, when they first start trading with real money, they are NOT at all ready, and so wind up practicing emotional, sloppy, scared, angry, losing trading.
The effect of this is that the more they do it, the more it reinforces the patterns, responses and behaviors
It also means, the longer you do it, the tougher it will be to UNdo the damage and re-train good trading practices.