You can right click with the mouse Apple includes (click with two fingers on it IIRC) or do what I did; toss that piece of crap in a drawer and spend 30 bucks on a decent mouse with real buttons.
LWJGL (which Minecraft uses and recently updated on your machine) no longer interprets Control-click as right-click on Macs. Vote up the issue on Minecraft's bug tracker so Mojang gets a proper headcount on affected users: https://mojang.atlassian.net/browse/MC-13695
And you can see where it's been reported to the LWJGL team, which is where Mojang says responsibility for the fix lies: https://github.com/LWJGL/lwjgl/issues/37
In the meantime, you'll have to assign "use item" to some other key (or use a two-button mouse), unfortunately.
https://mojang.atlassian.net/browse/MC-13695
And you can see where it's been reported to the LWJGL team, which is where Mojang says responsibility for the fix lies:
https://github.com/LWJGL/lwjgl/issues/37
In the meantime, you'll have to assign "use item" to some other key (or use a two-button mouse), unfortunately.
Just get a new mouse. The mouses issued with macs suck anyhow.
"Yeah I do." "Oh."