There is a subtle line there between what you actually love, and what is practical to be worked on. I am not saying they cannot coincide, but they are rarely so.

What one can try to achieve is a transition from one to another. That's why hackers are in big advantage these days. They can build stuff which can make money to fund the stuff they love doing... Struggling is always bad, but struggling on stuff you love would make it even worse. Don't let that happen...