You can never live your life without making mistakes. Yet your life after all is never defined by the mistakes you make, but what you do with them. While a black stroke will ensure that the best you will ever get in your life is a grey palette, it is up to you, the artist of your own canvas, to determine how best to accentuate the brightness in your masterpiece called life with shadows and highlights.
Unforgettable mistakes doesn't mean the end of the world. It just means you have to work a little harder to turn it into something that won't spoil the entire picture, and with time and experience, perhaps, turn it into something people would pay you a whole lot to see for themselves.