Sometimes I get this nagging feeling in the pit of my stomach. That feeling says that my dream is too big. That nagging feeling tells me my writing is not that good. That nagging feeling tells me I'll never be as good as this author or that author. That nagging feels me that I am not enough exactly as I am, and that nagging feeling is wrong. I am enough and when self-doubt starts gnawing at you, know that you are enough too.
My self-esteem is a work in progress. I have come a long way from where I started, but each day I take some time to practice loving me exactly as I am, with all of my flaws and weaknesses and imperfections. Some days though, are harder than others, but at my core I believe I am a good person, and that person doesn't change because I'm having writer's block, or because someone criticizes me or my work. I have great hardware. I have a solid foundation. And sure there is room for me to grow, change and build but I have to have faith in the strength of my character and the beauty of my soul.
There is no one on this planet who can be you, besides you. Your unique being contributes to the world in a way that no one else is able to. It is OK to have ambitions and there is nothing wrong with pushing yourself, but don't push so hard that you forget to take stock of how amazing you are right here and right now.