When you allow yourself to think and dream, what do you really want to do? What passion are you holding back, not allowing yourself to realize? What reasons do you have for holding back?
What needs to happen for you to do what you really want to do? Sit down and write it out. Start at the top of a page with whatever you're dreaming of doing. Now, write out the steps below that would allow you to do it. Can you do step #1 now? If not, break down this step into smaller steps to figure out what you need to do to get to step #1. Now, what needs to happen for you to start on sub-step #1?
If you actually do this, you will realize there is nothing stopping you from getting started. You don't have to have the entire plan in place or the ability to do all the steps right now. But, you will find it is much easier to do step #2 once you start and do step #1. What are you waiting for?