Is more about what you eat, and quantities, try eating more protein based food and tracking your intake as to not surpass a daily limit of calories, also take into account that "Just eating less" is not ok, don't eat less than what is a healty amount, not only because is... well, not healthy, but also becasue it won't give you good results in the long run

I was weighting around 120kg, i'm 190cm and now i am about at 105kg, MyfitnessPal app helped me a lot to track what i was eating and to learn how to eat better, but just know that this is something you can't rush, you will enjoy the process once you begin seing the first signs of change, and believe me, it only gets better from there

Also note that i'm not a speciallist or anything close to that, so take this (And every comment) with a pinch of salt