Am i fat and should i diet?

i am 5'1 and weigh 128. apparently im really fat. but, i dont look fat, i dont feel fat and nooone htinks im fat. but according to these charts im liek obese. but im a size 2 and i dont know wat to do. if i lose more weight im not gonan liek the weigh i look ill look bony but then wats with all this chart stuff? bc according to that im rly fat