There isn't anyway to make or predict your period. I suggest you just wait...it will happen. I cannot give you a certain age because every girl starts at a different age, some can start at the age of 11 or even 16. But sometimes, it might depend on your diet or how much you exercise. If your 20 and still nothing happens.. than go see a doctor!!
Its not something you can just induce when you want. it just happens as part of puberty. some girls are 9 when they get their first other s in their early twenties. those are exceptions mind you but it does happen.