My sister just lost her virginity!

Jennifer • 16(almost 17)•Saved•Dating•
Me and my sister are really close and we tell everything to each other. Well today i came home from work and she wasnt there.. (She is in 9th grade) Finally she came home and i asked her where she had went and she sat me down and told me her and her boyfriend went to the back of..(tmi) anyways she said she had sex! I was really angry but im not sure if im over reacting or not. PLEASE tell me what i should do.

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