Is my weight all right?

k..... so i am pretty sure i'm 5 foot 7 inches and between 115 and 120 pounds and i am 12 years old. i dont have a scale (the last time i weighed myself wuz at a friend's house). sometimes i freak about what i eat and i try to count my calories, but other times i just eat whatever. i exercise at least 30 minutes about 5-6 days a week (or more). people think i have a really bony , but i have a lot of friends that are thinner than me. im usually a size one or two in pants...but my stomach (mainly my obliques) is kinda flabby.