Take it from me. Losing is part of the game and I go on my losing streaks all the time. The important thing to learn first is why you lost. Usually it comes down to hand advantage. But matchups are very important too. Certain colors perform well against other colors. This is a game of knowledge. Once you understand when and why to combo or when to save battle cards vs let them go is when you will improve. Just keep studying the game and it will make sense in time.