I am EXTREMELY ANGRY.

I have been trying to build a farm in Creative mode, but I've come across an issue where wheat just refuses to be planted. Try as you might, no matter how many times you click it just won't plant. Also, any neighboring blocks placed next to it instantly destroy the block, which makes using /fill absolutely pointless. I have no idea what's causing it, either. I can't tell if it's the farmland or the wheat itself, but it's still annoying. I've tried restarting the game, I've tried optimizing the world file, and nothing seems to work. Please fix.

EDIT — I have a very small brain.