I Was Shocked To Say The Least...

I walked in on my parents tonight, I was shocked to say the least. I was in the living room watching a tv with my boy friend and my parents were in their room "watching tv" or so I thought. Well the phone kept ringing so finally I went to look and see who it was, so I seen it was my uncle from prison so I ran to my parents room to give my mom the phone.  Now I can't think of one time that I haven't knocked on the door before going in their room... except this time. I was in such a rush to give my mom the phone I really didn't think about knocking, plus the door was partially open so I just stuck my head in and then I saw them... I was just soooo shocked! All I said was "Oh my god! That was nice guys, thanks alot for that!" and I just turned around and walked back to the livingroom where my boyfriend was. I just sat there and was in utter shock and disgust. I could not believe what just happend! I sat there and prayed that they just wouldn't try to talk to me about it. Afterall I am 17 and it not like I dont know what sex is. My paryers went on answered though. The second my boyfriend left my mom came in the room and started yealling at me. saying "Why didnt you knock!?" "How come you just came in like that!?" "Whats your problem!?" So there I sit thinking, how am I to blame for this? Well I explained to her the whole open door thing (which she denied) and that its not like I WANTED to see that!! I would do just about anything to take it back. She just yelled at me some more thought and told me my dad was super pissed at me. I just sat there thinking, how is this my fault? Why wouldn't you lock and close your damn door when you know that your kid is home!?!?!  I am so sick and tramatized over this its not even funny. I don't think I will be able to look at my dad or speak to him for weeks. Its going to be so awful its not even funny. I just  can't get over the fact that they blamed me though!!!!!!