Mixed wrestling; girls are better than guys

I attend a local gym, which also offers boxing and wrestling for both males and females. My girlfriend goes to this gym too (it's where we first met) and we've ended up having a series of wrestling matches with each other. My girlfriend has beaten me every time! In fact, even though we are dating she doesn't hold back on me and pretty much wipes the floor with me! It's nothing personal - she just has a strong competitive streak. I don't think her always being victorious has anything to do with our age or background - I'm an 18 year old white guy and she's a 16 year old black girl and we're both quite fit. She is younger than me and a bit shorter too. Neither of us had wrestled before but she is just quicker, stronger and outsmarts me. And this doesn't seem to be exclusive to us - mixed wrestling matches at this gym are generally dominated by the girls.