let it go- "get over it!", "give it to god" or more eloquently - ".grant me the serenity to accept the things I cannot change, The courage to change the things I can, And wisdom to know the difference." If you can do that, life is soooo much better.
Stop asking yourself what if you can't do it, and instead as yourself what if you can? What if you can write a bestselling novel? What if you can accomplish your dream to be a published writer? If you're willing to work for it, you can.