You Can't Do What You Want By Doing Something Else
Although we admire when someone can do something unique and creative, society is set up to resist such attempts. Your parents, with all the love and best intentions, will urge you to do something that "makes a good living." Your friends and coworkers resist behaviors that might take you away from them, and will tell you stories of how this or that person tried and failed. And hardest of all, when you are ready to make your leap of faith, the temptations appear; the tremendous opportunities that for some reason only come out of the woodwork when you are ready to walk out the door.
There's a quote that appears again and again in various forms: "close one door, another opens." It seems like magical thinking until you see it happen. And it only happens when you don't leave the door partially open, but instead firmly close it. For some reason, being certain that you're ready to move on does cause some kind of magic to happen, and I don't know why.
This doesn't mean it will be easy. But your struggles will be towards happiness rather than trying to avoid some litany of unpleasant things as most people do -- and most people (over 80% in this country, it appears) are unhappy in their careers. And knowing that you are moving towards something that you love (even if you don't yet know what it is) seems more likely to make you happy than just marking time in a job, waiting for something to happen so you can start doing what you really want.