17 year old student athlete losing weight to fast

I've been trying to lose weight to improve my height to weight ratio for lacrosse and I'm currently 5'9 130 lbs. I've been losing around a pound a day so I'm getting in shape really fast. I would eat around 1600 calories a day with a caloric deficit of 500, which is what most websites say to lose a pound a day. However, this has been getting me to lose more than a pound a day. My weight loss always consists of 1lb of body fat and 0.5ish lbs of water weight. Should I increase my calories or should I keep this up? I've also been doing 45 min to an hour of cardio a day and I've noticed I'm not getting as tired as I used to when I do exercises. I don't do any weight lifting since I'm trying to lose weight. <br><br>TLDR: 5'9 130lb 17 yo lacrosse athlete who does cardio exercises but I'm losing more than 1 lb a day.