If you think you're screenplay idea is bad, I can show you one worse that got produced. Keep your head up and keeping writing.

Part of me fear failure in terms of reviews & results but I've also witnessed great filmmakers go through it and keep it moving. It's like having a bad game in sports.

You move on from that game.

One more thing, don't take everything someone says about your writing. The adjustments you make may make a few happy, but piss off thousands who would love your original work.