You have to love your adversaries. They make you better. They force you to improve, to stretch your capabilities. Competitors respond to a challenge from their opponents, and to negative motivation as well as to positive. Competitors seek revenge for losses. They crave a compliment if they haven't gotten one. Competitors want to prove everyone else wrong. They want to show skeptics "I am better than this. I am a winner."
You competition makes you better. Having worthy adversaries stimulates your work ethic, and brings out qualities you may not have known you had. So don't resent them.
You should love your competition. And you should thank them.
From "Reach for the Summit" by Pat Summit with Sally Jenkins