People often think that ‘something external has to happen’ before they can start doing x, y, or z.
Rather, something internal has to happen. The first step is to stop waiting for others. Instead, get started!
Want to start designing buildings? You don’t have to wait until you’re a certified architect – start designing Lego buildings, make a small structure, start experiments with an architectural computer program, and so on.
Once you get going, you’ll get a better idea of what is actually involved, what the specific challenges are, whether you really want to do whatever it is, and so on.