You said that you were worried that your map wasn't good enough. You said that you worried that your maps wouldn't be real enough. Then you compared your first work to the completed work of someone who did lots and lots of maps and spent many hours to get to that final product.

Short answer: Don't Do That!

The only way you get better is to practice. And that means that your first few products are likely to be less (finished, polished, sparkling with perfection) than you would like. The first time you sat down at a keyboard, did you type 220 words a minute? Probably not. When you first picked up a pencil, did a beautiful sketch of exactly what was in front of you come out? Probably not. The hardest part of any new skill is to be willing to fail and having others see the failure. You'll learn a whole lot more from discussions of your failures than you will from just looking at your successes.

As a lot of folks have pointed out, feedback is essential to get somewhere. That means that you have to provide something for others to provide feedback to. Even if you don't like it, post it. Point out elements that you think are problematic and see if others have suggestions about ways to improve. It's tough, but it can be done.