Whenever I left click my screen flashes and I can click so much or so fast it crashes my game. (I even changed my AMD)

Whenever I launch and load minecraft its fine and dandy. Then I left click. My screen flashes. If i click to fast it crashes my game. If I click too much I crash.

What I expected to happen was...:
No screen flashes

What actually happened was...:
My screen flashed on left click

Steps to Reproduce:
1. Start Minecraft
2. Left click

Evidence (Screen capture) https://youtu.be/fXKLeyLeYbU (its private)
(Sorry about the name and stuff )