This is becoming a problem in my marriage and has always been a problem in my life. Basically I am very bad at arguing or defending my point of view.

When an argument does start, I either end up always repeating the same thing, or I end up not saying anything in defense of myself even when I do know what they are saying is a bad argument and any other person would be able to tear apart that argument. Also often if someone is telling me something, I often become immediately convinced they are correct and I'm highly suggestible. Sometimes I tell someone later what was said and they get mad that that person said that and they wonder why I went along with it.

Like for example my landlady's boyfriend is my husband's best friend. They are doing stuff that is illegal for a landlord to do and I got fed up with it and tried to argue, but I could only muster a couple of words now and then. The worst argument I heard was "we are not your landlords, we are you're friends and that changes everything". I knew that that statement was crap, but I couldn't give a defense.