It can be hard to let go of something we really want.  But if we look deeply enough to see that that desire is actually hurting us, it becomes easier. Because of my desire for the admiration of others, if I get easily disappointed or offended, it is my own thinking that is making me uneasy.  If we become so anxious to achieve something that we cannot stay calm and think clearly, it is our desire that has disturbed our ability to perform well.
If we look carefully at the real source of our anxieties, it is often our unhealthy attachment to something that gives rise to it.  When we see clearly that we are hurting ourselves, we can choose to let go. If we want to enjoy life, we can choose to do our best, but be satisfied with whatever outcome occurs.