im 18 years old and i haven't had my period for almost a year, but i had it once when i joined a fitness club, and then it stopped again. is this bad? it's almost 1 and a half year.

Hello and thank for sharing your question.

During adolescent years, it is common to go without a period for extended amounts of time.  It is not dangerous or cause for alarm.  

It is only necessary to have a regular period if you are trying to conceive or you are experiencing severe negative side effects every month without any bleeding.

If you wish to have a regular period however, doctors usually suggest that you take an oral contraceptive.  These pills give you the necessary hormones needed to have a regular period.

Faith