I'm a very competitive person, and I love this game but, I DO NOT take losing very well. Not because I think a character is broken or overpowered. For instance I just played a duel against a warlord and lost 3-2 it was a great fight, and he was a good player. I know I shouldn't be angry, I mean I did well. Made mistakes yes, but I did ok. Maybe it's just a pride thing. Anyone else feel the same way?
In the title you wrote about the need of an advice but in the post I couldn’t find the advice you are looking for.
If it is about how could you reduce the frustration on losing, I would suggest to play team vs team matches, where you can blame the people in your team for losing ....then after all that practice and getting better you can move to 1vs1 fights and perform better
Regards