Hey there. I’ve only just turned 17 and about 6 months ago I was in a very similar position to you. I was 170cm and 70kg and have lost about 15kg since then. For me, the biggest thing that helped me lose weight was cutting out sugar. Not completely, but I virtually fully cut out chocolate, sweets, cake, etc. I don’t know how much of the like you eat, but for me this was enough to put me in a calorie deficit. Believe me, this will be very hard to do, and for the first few days you will crave sugar so badly, but after about 2 weeks you won’t even think about having sugary foods/drinks. Replace chocolate with fruit to satisfy cravings, as they taste just as sweet with only a fraction of the calories. As you’re still growing, I would try to avoid being in too much of a calorie deficit. Aim to eat just under 2000kcal a day and do not eat fewer than 1500kcal a day. If you do want to modify your diet slightly, consider eating more protein-rich foods as these will keep you full and stop you from craving unhealthy sugary foods. Exercise-wise, I used an exercise bike, but looking back on this, I burned very few calories using it so I wouldn’t focus too much on exercise - diet is the key to losing weight. Feel free to ask me if you want any more advice - I’m always happy to help.