well, lisod kaau imong situation sis, pero all i can say is since u r 18 y.o might as well just go back to school.. tell your mom that you want to go back to school and finish it and live ur own life. para in the end pag na realize na sa imo mom na, "hey what you have been doing is totally wrong. at least, you can still tell her the right thing she has done when she was at the stage of hopelessness."
Just a thought ra. =]

you have to let your mom be.. there's a saying, "you cant teach old dogs new tricks"
so no matter how many times you tell her that what she is doing is totally way out of hand. She will still do what she thinks is right.