Jo M. Thomas
Write because you need to. Keep writing. Do your best to enjoy the process, or trick yourself into it by rewarding yourself for a job well done every time you come to the end of a writing session.
However, if it's about getting published, remember it's highly improbable any of us will be the next big thing. It takes a certain amount of luck to get noticed and to get things turning over. That said: keep writing. The more you practise, the luckier you'll get.