Nobody can be right 100% of the time, even 90% or 80% of the time is very unique on the long run. Being wrong isn't the problem, not recognizing you are wrong is the problem.
I have a stock trading strategy, swing trading, which has a win rate of around just 50%, but my profit factor is 1,6-1,7 and my largest win is more than twice the largest loss, so i still make a good amount of money, specially in these conditions which my system was made for.
Protecting the downside is as important as making a profit.