i am a 40 yo man that has been raising two daughters alone for 8 years they are now 19 and 17 I have never had a single problem from them until now my 17 yo is acting crazy, she is lying to me I have caught her several times and she lies to cover up the lies, she says she is going to a friends house and goes God knows where, pretty much anywhere but where she says she is going, then whenever she's caught in a lie she says she is cutting herself and threatens suicide, she has went from a great kid to a standoffish in a span of about 3 weeks I don't know what to do her mother is not an option as she is a drunken so I'm all alone here any suggestions?