I have not seen a trader that do not lose sometimes, i may be new to the forum but been learning before now. it has nothing to do with sentiments but traders have to learn to accept trades the way it is, without attributing loss to any factors; as it leads to more rekts.
Always accept the market as it is without blaming any factors.
Always dyor too
Before entering a trade I always have fixed percentage loss ie 3% of my portfolio is my risk in any event of a loss I am sure of losing small portion of my account while I ensured my reward is double my risk.
A loss in trading is normal however a sound money management and working strategy is the key to a successful trading.