28 days is a normal cycle mom the average person beyond this is abnormal! have you ever check this with issue with your gynecologist? Obstruction of a woman's menstrual flow stems from many underlying problems however, from my experience polycystic ovaries do cause long absences of a menstrual cycle...go speak to you doctor this is very serious. We are all here to support you as well so stay in touch. God bless.
CALL YOUR OB so they can do an ultrasound make sure no blockage and they could do blood test to check your hormone levels
its normal that some girls has irregular period.
To a point it's normal for irregular periods : although you will find there are many teenage girls on birth control not for sex but to regulate their mensutral cycle. You need to get checked and tested There are many different things that can be going on... You don't want to mess with you fertility since ONE DAY WHEN YOUR OLDER you might want children. My aunt had to take B/C pills from age 13 till 27 to regulate her cycle I was on to regulate cycle do to painful cycle that b/c pills made more regular and less painfull....