Im 10 when will my period start?

im a 10 year old girl and my family has ben telling my im gonna have my period soon for a year. im healthy ind my Weight well never mind that.my best friend got hers a week before school ended and in that week she became the most popular girl in my grade .but i had more centimes i have stomach aches cramps and bloating in my privet.i think i have to pee mostly at home after school but there is nothing.my privet hearts when i do # 2 .and im inpatient i apologise but i just want my centimes to go a way for at least a week