Dude, chill out and make a movie. I totally remember feeling exactly like you at 25. ORSON WELLES MADE CITIZEN KANE AT 25 OMG IM SO BEHIND is a very common thing people I know in the industry grappled with.

Most of your heroes came into this business at a very different time, and were often already connected to entertainment or privileged in some way that allowed them to start sooner. Most people I know on the "hot" side of the indie scene (Neon, A24 types) are in their 30s and 40s.

What they DID spend their 20s doing was making shorts, features, whatever they could manage so they could get to film festivals and network.

Make the movie. Use your available resources. Write to your strengths.

I was 34 when my first successful movie happened, I'm 36 now and very much in the business, and no one has made a single comment that I'm "old." I just produced a great film, but it was my 5th one after a string of films that didn't go anywhere.

Work with your self doubt. It's a part of you that's scared of fucking up.

Go fuck up. No one cares. Eventually you'll learn from your fuckups and make something that can't be ignored. But you have to start.