Is there anyway to disable ctrl-click? I've been trying to play some games on my macbook (running on mojave) and whenever I try to hold CTRL and click it won't let me. Is there anyway to disable Ctrl-Click?
CTR-Click is essentially right-clicking the mouse, and there is no way of remapping the keys without downloading 3rd party applications. 

Karabiner can do this for you:
https://pqrs.org/osx/karabiner/

You can use it to map CTR-Click to left-click and it should work as you want it to.