taytaylewlew11 Please create a new admin account on your Mac and try playing there. Don't link the account to your Apple ID; you can skip that step. And don't change any graphics settings yet, other than possibly switching to windowed mode if you want. And don't add any content like mods or old saves.
Please repair the game while in the new account (EA App > Sims 3 > Manage > Repair) before launching the game. It's not strictly necessary, but this does restore some hidden files that are necessary for other functions like installing Store content.