What am I doing wrong?

I’m trying to loose weight, a lot if it and as quickly as possible.

I had 1500kcal yesterday

2 litres of water and

14,000 steps

120 sit ups

Plank

And calculated that I burnt more than I ate

BUT

I hardly lost anything!

I’m hating myself so much right now.

How can I loose weight quicker?

Please helps me!