How many calories should i eat to lose weight?

im 16 175 5 11 and im tryin to lose weight ive lost over 58 pounds but im tryin to get skinny im still fat and i want to know how many cal should i eat i thought the only way u lose weight is if you burn more than you eat but know im seeing if you dont eat enough your body will store those cals and hold on to the fat cuz it thinks ur body is starving it self so if u eat enough it will speed up ur metabolism is this true i though i less i eat i will lose weight faster i burn 500 Pretty much everyday for breakfast i eat one piece of toast 80 cal lunch a special k bar 90 cal diner wht ever snack a green apple and any advice on how to lose my last 12 pounds i would realy like tht info thx