Please take a pregnancy test. If it's negative, then you should make an appointment with a Ob/Gyn to see why you are not receiving a monthly period and to maybe discuss birth control options to find something that is right for you. You are only 14, trust me, you really don't want to be a mom just yet, especially when you are just a kid yourself. I'm not judging, nor am I trying to be mean, I just hope you'll think it over. Please start using protection.