Unable to click

So, I was just hopping onto my friend's server(on minehut) and I was fine for about half an hour, and then I couldn't place or break any blocks! I checked if it was my mouse, but it wasnt. And I can scroll along my taskbar, open my inventory, do commands, etc, and then I pressed esc to get to the pause screen, but I couldn't click any of the buttons, and so I had to just close the window. I had to reopen Minecraft to report this bug, and Minecraft is very slow on my computer(I'm using windows) and I could also click any where else on my computer.

 

Thanks,

 

Fox(your "biggest" fan)