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.
Who else is guilty of this? I'm pretty sure I've used every one of these at some point. Truth is that there are no excuses when it is something you want bad enough. Let's make 2015 the year of no excuses.