Double majoring, joining a sorority, doing student government, doing a club sport, AND going out three times a week sounds like way too much to do as a freshman.
I agree that you probably only need one major on a pre-law track; you can always take classes in the other major to explore that interest. If you really want to join a sorority, go to NPC recruitment in your freshman year (assuming you want to join an NPC sorority, which most sororities are) and join one. Then see what happens. Sororities offer opportunities for many social events, so you might go out or do fun things 3x a week just through the sorority itself. After you’ve gone through recruitment and the new member program in your sorority, then reevaluate and see how much extra time you have left over - and that’s when you can decide whether and when to add extra opportunities. As an added bonus, a lot of times Greek membership can boost your chances of getting positions on student government and such later in your academic career. It’s unusual for freshmen to have significant positions in university SGAs anyway.