I can't Left or Right Click! Please read more below and help me out.

Whenever I am in my inventory i try to left click something and dag it somewhere else, it never works, it doesn't let me pick it up, it is almost as if m left click button doesn't work but i exit inventory and press left click and it works, Whenever i am trying to play on a server, I click on the mini game I want, but nothing happens, I try to spam it and it doesn't work, I try to hold it and doesn't work. I really hope I can start playing Minecraft again.