So I'm sixteen. I spend a lot of time with my step mom, my mom, and my best friend. all of them are on different schedule. my best friend got her period before me but didn't take after her mom. I am never regular. I have gone almost four months that without a period and it scares me sometimes. I'm want to have my own schedule so I can stop being so scared.is this possible? and if so. how can I do it?