Writer's Fallout Shelter

Hello,
I feel like that alot i wonder if I am just fooling myself with this idea to be a writer, yet in the other hand it's all I think about (my novel that is.) In one hand it consumes my life, my attittude is this is what i want to do . What I've always wanted to be- a writer. Other times when i am reading over my chapters I am thinking ok will this be good enough. Showing my beginning chapters to my co workers I have gotten mixed reviews. People have said they really like it ,and complement me on my use of imagination and such others went striaght to poininting out my errors (even though i warned them a head of time). I read a article in WRITERS DIGEST that talked about the ten mistakes that writers make and this was one of them. It says to mute out that liitle voice that is feeling you with doubt. So that is the advice I give to you once you start to hear that voice STOMP IT OUT. You like me and everyone else (writers, poet's and such) are good writers- we just have to work at out craft.
I wish you all the luck in the world and you can do it.