If you want to stay positive even after some losing trades, then it’s also worth taking a proactive approach to losing -as oppose to being reactive to it.
For many, they use the visualising technique. This involves relaxing and trying to see yourself already having lost the trade before it happens. This is some what similar to having no expectations but you make an effort to mentally rehearse the lost. By rehearsing it, you will include your emotions in the rehearsal and start to anticipate how you will feel so that you will not react to it if it does happen.
Many Master Traders probably do not use this technique but they have gone through enough winners and losers to know how they feel. In my view, that is an reactive approach and that is in line with my next point below.
Don’t get me wrong, I’m not saying that visualisation is the best way. But I’m suggesting that you should find the method that best fits your personality. And, to me, that is being proactive.