HI Wlcome to H C M Yes , we should exclude thyroid disease & other causes of obesity. Are your periods normal. Weight of a person depends upon many factors. If you want to loose weight you can do, certainly. You say to yourself . I can do I will do I is difficult ,not impossible What about your Parent s body obese, lean ,normal Avoid spicy,non fat Food, ,cola,beer,alcohol,tea,coffee,fruit juices( they increase calories),sugar. Take plenty of mineral water ,leafy vegetables,fresh fruits ,vegetable juices,increase protein. Consult with dietician. Blood test for -Thyroid profile .Sugar ,Lipid Profile -Urinalysis Check your weight weekly Wait minimum for three to six months You will be in shape Take sound sleep Best of luck Any query always welcome