I’ll let you in on a secret:
You’re going to be someone’s favorite author one day. One of your characters will be someone’s favorite character. Someone’s going to debate the best way to cosplay as one of your characters.
Someone’s going to quote you. Someone will have a tattoo of your words. Someone’s going to smile every time he/she sees your name at the bookstore. Someone will get excited when a new book of yours comes out, running to buy it.
But none of that can happen if you don’t write now. Even if it’s not good, just write. You can always edit later.