Genetics is what gives. Kelly and Jodi excel as lifters, and this is why you know who they are. And they didn't just start recently. But lots of teenage girls pull 3x bodyweight+ every year in Texas high school powerlifting meets. They are atypical females in that they are gifted genetically and developmentally. You may not be. But the fact that your squat is "worse than the untrained person" indicates to me that your primary problem is probably a lack of coaching. Address this first and you'll be much farther along in your attempt to catch up with Jodi and Kelly.