if you want to be serious about writing you should go into it with the expectation that you will not be successful with it and probably will never make any money with it. you should really internalize that first and then ask yourself if you still have something that you feel like you *need* to say, like you have been given some task that you must carry out even if no one is listening. if so, then in my experience all other difficulties will be annihilated as long as you do the work