Did i eat to much today and will eating this help me loose wweight?

ok so im 15 and 122-123 lbs and i am crazy about dieting and losing weight and i wanna loose weight so bad and people say i dont have ot but i still wanna loose but anyways i had a half of granola bar for breakfast a greek yogurt for lunch and a chef salad for dinner with a weiner cresent(very small) this stuff is ruining my life (counting calories) do u think i ate to much and how to i loose weight fast