im thirteen and i am always hungry and always thirsty, i have headaches all the time, and i have glasses but i still get kinda dizzy, i am also adopted so i dont know family history. i am concerned about having diabetes, i was told this by my friend, who has a sister with diabetes. she told me to keep an eye one it, but im still not sure, im am not loosing weight i dont think, but i need help, and i dont know what it could be. also im tired all the time, and i have been urinating more then usual. i have also had a cold for the past four months, and i know it is not allergies because i have given it to practically my whole school. does any one know what it could be?