Some dreams remain fantasies because reality would require vulnerability.

Keeping a dream as a dream protects it. In imagination it stays perfect, no one has judged it, and you have not yet discovered whether you can do it. Making it real requires exposure, effort, and the possibility that it turns out smaller than you hoped, and that possibility is what keeps many people at the fantasy stage indefinitely.

Take one long-held dream and find the smallest real-world action it implies. One class, one conversation, one afternoon of actual work. It will cost the dream some of its perfection. What you get instead is the beginning of the real version, which is the only kind that can happen.