You're definitely not alone. I used to wait until the very last second to start my studio art projects in college because I knew I couldn't perfectly recreate what was in my head and anything less was failure - even if I got an A on it and it got the most positive comments during our class critiques.
But then I started doing the opposite where I would start my projects like wayyyy too early and I would finish it, throw it out, and then start over because it wasn't perfect enough. I don't know if that was any better. There was one project that I scrapped three times before I finished it. It was over 85 hours worth of work. (Brag moment but it was totally worth it because I ended up being the only one in the class who got a perfect score on every single one of my projects and it was entered in a handful of exhibits and won awards in them. Even in the professional division hollaaa.)