Do you honestly think I am fat? ?

hi. i am a 15 year old girl who is 5'8 1/2" and i weigh 145 lbs!! my brother calls me fat all the time.... i am a pageant girl. but my friends always say im so pretty and skinny and my ex boyfriend told me i have a "hot Hot HOT" body but idk... im never comfortable in my body. ever. i always feel like a fat pig. i eat about 1200-1500 calories a day and i count everything i eat on the netdiary app. i feel so fat. i want to weight 100 lbs so i can be underweight and never have to worry about my weight again. i hate my body.... i hate it so much. i feel all flabby and fat. i do the pinch test to myself all the time and i feel like i have too much fat. i hate my body..... am i fat? honestly? in ur opinion? i alredi know i am so its okay if u say yes......