Ok so I am 18 years old and do not have a regular period. I am not sexually active, i missed my period this month and now have a dark brown discharge that smells weird. I am really uncomfortable about going to the gyno/doctore for this because it does smell and is embarrasing. What do I do and what could it be? I am afraid to go to the doctor because it's gross and I'm afraid...

Please help me

Thanks