What do i do? my step mom always thinks im lieing omg. im 17. i need advise from fellow teens. and sum parents

Listen sweety I am a mom of a very spoiled 16 year old and granted she isn't my step daughter but when you give your mom or step mom grief all the time its really hard not to give it right back to you!! Try not giving her so much attitude and simply ask her how you both can work on your relationship. When she gets up off the floor then maybe you guys can discuss ways in which you can do things to prove that you are not a liar..