i'm 15 years old and i was just looking at pictures of myself from last year and i look skinnier than now. my face is fuller and my arms seem bigger now. i'm 5'4" and the last time i checked i weighed 136lbs but there is a possibility that i weigh more now. is that normal that i gained weight? i heard somewhere that it's normal for teen girls to gain weightaroujnd this age but im not convinced. oh and if you have any good exercises/tips on how to lose weight then feel free to put them in your answer.