Need very fast help...extreme weight loss

[elecom]

Hello, i am 16 years old. Currently i am on diet, but its very simple, i just don't eat chips and other junk food, don't drink any soda drinks and don't use sugar and salt. But eat more vegetables and fruits. I easily hit 2200kcal in a day. Saturday and sunday i have "diet off days". I workout at home: push ups, dips, some running, squats and sit ups (5 times in a week). And this week i started exercising in a morning for 5 minutes max.

And this is why i need help.

Last month i know that i weighted ~98kg.
Last week i weighted 97kg and waist was ~95-96cm, neck 41cm.
Yesterday i weighted 94kg and waist was ~93cm, neck 40cm.
And today i weight 93kg! and waist is ~91cm, neck 39cm.

According to measurements i am getting lean, but in a mirror i still look chubby.
Workouts is getting easier (i easily hit 100 push ups, what last week was hell for me)

Who says that its water weight: i have been workouting with dumbells for around 1 month before body weight workout. And I always drink about 3l of water everyday.
P.S. i don't feel tired or something like that, and always good mood. I am never hungry...

questions are:
1) Why i lose weight so fast?
2) I think it's too dangerous. isn't it?
3) Why i am getting lean, but still look chubby?

P.P.S. height is 195cm.

[Boss Man]

1) Why i lose weight so fast?

(That is probably just some water weight, so don't worry about it. Yes some fat might have been lost but the water weight thing is a likely scenario, because if you changed your diet and cut out a lot of salt in the proecess, then the water retention effects excess salt causes will be reversed in part or in whole, relative to how much salt is cut out.)

2) I think it's too dangerous. isn't it?

(If it happened because of what I said then you needn't worry, as it should stabilise)

3) Why i am getting lean, but still look chubby?

(Thet might be a bit of muscle gain as well, as you said what you're doing is getting easier.)

[elecom]

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I have just figured out, that i really have more fat on waist, but measurements are smaller. What the ...?

[Boss Man]

If you're taking measurements, then you want certain ones.

Biceps flexed and measuring around the peak, not the edges.

Waist just above the hips.

Calves arond the peak, not top or bottom.

Neck, self explanatory.