A difficult obstacle cannot be surmounted until you take charge of the situation and consider your options.
We can't be perfect. We can't ever reach perfection. It's an unattainable goal. But we can set ourselves high expectations and rise up to meet those expectations. As the saying goes, even though we can't reach perfection, we can chase it and catch excellence.
Don't waste too much time mourning for things that you didn't get. Allow yourself to feel the grief, but move on promptly and walk confidently towards the future.