Hello (((EVILDOUBLE))). I am going to try to be very understanding towards you in saying this(PLEASE do not get offended). I feel that since you are not menstruating(having a period) this is leading you into being irresponsibel towards your sexual relationships, since you feel that you are SAFE. In this day and age it is very unwise to feel safe from STDs and pregnancy. I feel that if you are not where you should be in thinking correctly you should get on birth control since you have the opportunuty to get pregnant or STDs. I would highly suggest seeing a gynecologist to see why you are not menstruating (having a period) at this time and concentrate on being a bit more responsible with your health and well being mentally in not having a child in an unexpectant or irresponsible manner with someone you hardly know. Getting on birth control may actually help to get your periods under control and stop you from having to worry about pregnancy. You are very young and you should enjoy your life and not have to be tied down to a child (by accident) when it can be prevented and you can have the life you want at this time. I feel that your father is only entitled to so much information in your life as well, it is up to you what to tell him about your relationships you are over 18 and you can choose directly what you feel is the best to tell him. Take care. I hope the best for you in your future. Soidhonia