woe, shelf be upon ye

And hoo boy, have I ever been there. When I was writing prolifically, I just wouldn't read. I couldn't because I knew I'd go into that fic measuring mindset and declare myself the loser, have to step away from the keyboard and stare out the window a while. And if I had an exchange deadline? Absolute worst timing.

Not everyone goes through that of course, but it's more common than you think, even with so-called established writers. I've seen people delete wips or even their whole account over that burden of doubt. So here are some possible tips to crawl out from under that burden:

Table it. You're done for the day. You've been staring at that cursor for too long. You have no perspective on your work anymore. Go do something else: play with your dog/cat/fish, go for a walk, eat something, go to bed if it's late.

Re-engage with the source material. Watch an episode, read a chapter, listen to that podcast, whatever it is. Find that voice in your head that sings in harmony with the source.

Read positive comments left on your previous work. Trust what they've told you. Because the liar here is your doubt, not your readers.

Hit up that friend you trust and ask them to tell you your strengths. Even if you don't believe it right now, you have strengths as a writer. Maybe it's worldbuilding, maybe it's dialogue; your friend will give you concrete examples. You don't need a beta right now, that will come later.