Wife hates me

My wife 39F is horrible to me 40M. We have been together for 20 years. Everything I do irritates her. I cannot talk to her without her making digs at me. I’m sure she hates me and wants me to know. I love her, support her, never cheated and do my best to be nice but sometimes it’s so hard! I need advice. Why is she being like this with me? What am I doing wrong!?