I am 21 years old, I have had unprotected sex but I am not pregnant I've taken many tests but now my problem is that I have not had a period in over 11 months, I was never irregular with my period before I am really really scared that there is something really wrong with me. Somebody please help me, I do get period symptoms like cramps cravings and bloating and back pain. Another thing is if I'm not having a period where is all that blood going?

You have what is called amenorrhea. This means no or infrequent periods. The good news is that its not uncommon and not life threatening. The blood is not going anywhere, it's just not being produced. There is a cause for this, you and your doctor just have to find out what it is. The bad news is that you can still get pregnant like this, hard but possible, so don't have unprotected sex. You need to see your gynecologist to the answers you need. Good luck!