You should know your weight and height before you decide whether you are overweight. In any case, if you want to lose weight, you should start from three aspects: exercise, balanced diet and changing the existing lifestyle.
From now on, go to bed before 1 1 every day, drink more water (at least five times, 250CC each time), eat vegetables with high fiber content for three meals, eat whole lean meat, replace each meal with a bowl of rice or starchy foods such as sweet potatoes, and then don't eat any sugary snacks and fat, one egg and one glass of milk a day, and don't eat midnight snack and excessive fruits. Run at a fixed time every day, step by step, starting from running for 20 minutes, adding a few minutes every day, maintaining for 40 minutes, and gradually speeding up. The key point is to make your heartbeat reach 130 beats/minute during this process. Stick to it for a month and you will definitely lose weight. The key is persistence. Besides, you should find a way to get used to the body without the fat before.