I am not even sure where to start.  I have 3 teenage SK.  SD16, SS16 and another SD 14.  

One of my biggest regrets in life was getting involved with and marrying my DH.  I moved into his house and feel like I am an intruder.  His kids hate me, and they have since we got together.  His mom and the BM have made it clear I have no authority over them and they don't have to listen to me.