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 water many times (at least five times, 250CC each time), eat vegetables with high fiber content (300 grams per meal), eat whole lean meat (50 grams), eat a bowl of rice (cooked rice weighs about 150 grams) or use sweet potatoes for each meal. Don't eat midnight snack and too many servings of fruit (the amount of two apples a day), stay active every day, run at a fixed time every day, step by step, start running for 20 minutes (continuously), add a few minutes every day, stick to it for 40 minutes, and gradually speed up. The key point is to make your heartbeat reach 1 10-60 during the process. You will definitely lose weight, the key is perseverance. Besides, you should find ways to adapt to the body without previous fat. If you have any questions, please ask me and I can help you.
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