My Name Is Maria Durling I'm 16 Years Old And

My name is Maria durling I'm 16 years old and I'm from Coldbrook,NS Canada and my question is I started my period when I was 13 and in the past 3 years I only had it twice and it has been 6 mouths or more since my last one and it hasn't came back since. I getting really worry can u please help me? or if u already know what's wrong please tell me.