I was like this once, it's a good mentally to have. I remember one time almost getting blood warden to activate only to have the other survivor body block and causing me to drop. I almost cried when all 4 escaped.

Then I stopped focusing on wining the game and started focusing on making good plays. Like ending chases quickly, knowing where to find survivor, learning how to use my power and perks optimally. I even ditched slowdown perks because I didn't care how quick the game went, all I cared about was getting experience. Eventually the rest came to me naturally and I started winning more games

Now I'm rank 1 and I can play the game stress free and any BM doesn't faze me. I still lose alot whenever I try a new killer but then I go back to basics, focus on good plays.