We Are Always Butting Heads On The Little Things

Me and my woman have been together for 2 yrs. We are always butting heads on little things in our communication about her micro questioning what or how I do things. I give my opinion about things or give a breakdown on answering a question she may have and then she says that that’s too much info or I am talking to her like she is a kid or demeaning. I mean at this point we pick at every little thing we say to each other because we take it negative. I have tried to stop and just not react or be quiet when she says somethng or makes a deep sigh or face that shows displeasure like what the hell am I talking to you for. But still my whole demeanor changes and the anger shows on my face even if I don’t say anything. Or she says I don’t respect her opinion if I give her my view on what she is talking about.  FYI- I have this serious looking face even when I am not serious. Even my kids tell me I look too serious. So what I say comes across a lot of times as overbearing and controlling. I love her and she loves me, but we need help in our communication.  Thanks