Questions to consider:
Does pressure and stress bring the best or worst out in you?
What is your pursuit of success costing you?
The ability to remain focused, centered and make smart decisions when it matters most, is what 'playing in the big league' is all about. Taking the focus off 'winning' and working on self-mastery creates a healthier space within which to thrive, perform and achieve consistently.
Increasing self-awareness, knowing your own triggers, and establishing constructive coping mechanisms, leads to sustained healthy high performance. Learn to make stress work for you, rather than against you.
Do the right work and then get out of your own way!