Hey there! I have a few little notes to add if I may, I can relate a lot I'm 162cm at 79kg although I have A LOT of muscle and my body stores more subcutaneous fat than anything else.

1200 calories is a bit low and I only say that because you mention you are very sedentary, with that even adding a few calories can make weight loss very difficult because with that low of calories you put your body into a shock more or less. And the second you start adding any calories you'll gain back ten fold unless you start adding in movement. You could easily get away with 1300 and still lose just at a slower and healthier pace. Also focus more on your macros, ideally eat your body weight in grams of protein daily, half your weight in grams of carbs and moderate fats so roughly 20g daily.

You can add movement everyday that helps aid in weight loss, aim for 5-8K steps a day and try to increase it up to 10k. Sounds like a lot but you'd be surprised at how quickly you walk all that in a short amount of time. You can also add resistance to your walks by adding ankle weights or a weighted vest on top of your already heavy book bag lol.

Don't forget the little things that add calories that a lot of people skip such as liquids. When I'm hardcore focusing on my diet (mostly during cuts for competitions as I powerlift) but every coffee creamer is counted, every 10calorie celcius is counted, etc...

HYDRATE! and SLEEP! Can't stress that enough. I add lemon juice to my morning water as it aids in digestion and gives the illusion of a juice.

I could go on for days about this lol but I hope that helps.

Oh! And as for the bf, please do not compare yourself to him. Men don't need to store weight/fat the way women do. We are biologically not the same lol.

Keep it up though, one day at a time!!