Wife making unnecessary demands, not respecting my parents, what to do

Hi sir, I m a Christian boy married to a Christian girl since 2015. My is very arrogant n fights very often. She is a teacher in school. She doesn't do any work in house. Doesn't respect to my parents not my youngest sister. I always tried explaining her, she always told me to do my work. She always demands to go out for movie n dinner, she always buys bags worth 2000/- .Once I got very frustrated told to get separate if she doesn't stop her habits. She always start threatening me of suicide n she always calls her parents, they instead of explaining her they start teaching me, if I get separate I Wil have to give them whatever they demand. I have not taken any dowry nor a penny while marrying. I earn 14000/- pm I have 2 flats in my dad's name. She is earn 18000/- pm. My parents are about 60 of age. Please help me n give some idea to solve my problem.