Are you using a mouse or the Trackpad with that MacBook?
And BTW, I'm still using Mavericks.
And if using a mouse, check the System Preferences > Mouse as Apple used to ship all Macs with any mouse set to only left, single click to appease Steve Jobs who hated and tried to disallow two button mice and that right-click feature. Maybe some things haven't changed, or respect or some don't realize that Steve died some time ago.
You'll also discover the scrolling direction setting there, depending on what you call "Natural".
PS: control + left click is the same as right-click or
contextual menus of whatever it's called. Excuse me, I've only been using Macs for 25+ years.
And when it's all setup, the right-click to create a new folder will only work in the Finder and when the mouse pointer is over blank space and not over any file or folder etc.