How much should i ..................?

okay im 15 year old female,and i was wondering how much should i weigh.im 5'5 and as of now i weigh 153lbs.i sing in a band so im up gonna be on stage alot and be in front alot of people,so iwant to look my best and be healthy. i think that i should lose like 10 lbs.but i dont know if that is too little or what,cus i dont want to lose to much and look anerexic.