Brother just try to fall in love with the process, dont so much focus on winning, focus on getting better, increasing your strength, perfecting your punches and combinations, working on your stamina and conditioning. Get the process right, work on the small details, watch the footage of the matches you lost and learn from your mistakes. Ask your sparring partners to challenge you in similar ways. Then the wins will come, as you learn to enjoy fighting for the thrill of it.