It should fit okay. Your weight doesn’t quite play a role as far as if it touches the ground, unless you have a stomach or some other form of body part that would cause the gown to have to rest on top/drape over. Your main concern in my opinion is height, and if it is 4’10”-5’0”, you should be pretty close to the midpoint of that, so you should be fine! Also, congratulations on graduating!!!!!! Although times are tough right now, I wish you the best of luck leaving high school!