Hi Darkskythe,
At the main menu (The one where you can select which saved-game to play) Click the option button (...) select Options from that menu. Check for the Advanced Demographics Options tab - It should be the last tab.
Make sure Story Progression is checked on.
Then uncheck each of the types you don't want in your game. You can also opt your household out of the celebrity system by unchecking it.
When finished, click the checkmark and your done.
You can also use cheats to turn off supernaturals in the town your playing in.
To do this, press Ctrl+Shift+C at the same time to bring up the cheat console. Type in testingcheatsenabled on or true then hit enter. -- When done with the cheat, type in testingcheatsenabled false.
Shift-Click on the mailbox of your active family. Select Supernatural Population Control. Then select Remove Supernatural Sims from the world.
Hope this helps,
MrsFlynn