Ok, so my Minecraft won't open because every time I click it, it says

I've redownloaded the newest Java update 3 times (which is Java 8) but I've never gotten an option for an update for Java SE 6 Runtime...
I then thought it was maybe my Minecraft account, so i deleted and redownloaded Minecraft and that didn't solve it, unfortunately.
Any suggestions? Although I'm on a Mac I can work my way around this if you give me instructions to fix it on a PC.
Thanks

~Long Lost Prince Zuko