I missed my period last month and now is almost 2 months without it. I didn't have any intercourse

Hi there

I am 20 years old.I missed my periods last month and it has been almost 2 months I did not have my periods.I am unmarried and neither have any intercourse.I am afraid what's happening to me.I feel tired,dizzy and uncomfortable.It would be great if I could get advised.

Thank you