Period problems

I don’t know what to do I’m stressed out. I’m a (13F) and I haven’t gotten my period in 2 months. The last time I got it was on April 11th, and ever since then I haven’t gotten it. I don’t have a doctor of my own, and my mom doesn’t really have time to book an appointment. What do I do? Am I gonna die? I’m not even sexually active so I know damn well I’m not pregnant. What do I do?☹️