I have some thoughts on this and would like to reply and share when I'm in the right head space. So I'm bookmarking.
But in short....sometimes we must do the things we do, not because we want to, but because there are others that depend on us.
There will be a time when the only factors that you must consider in a decision making point is you. Until then give 95% of yourself to what needs to be done and give 5% (or less) to that thing you want to be your purpose. It keeps that candle burning long enough until the time is right for you and those that matter to you.