Unable to speak up when problems

well here is my issue, every time my boyfriend and i get into an argument and he starts raising his voice is like if something puts me in mute, the only things that come out of my mouth are: yes, no, i dont know, and like that,and that pisses him off, i just cant keep it to his level, and i start crying.. we can give a lot of turns to the problem and i mean a lot we can be there like two to four hours with the same thing and i end up apologizing for being that way, i don't know what to do, i know it is hard for him to understand me aswell, i wish a could stand up and say good things so that it can be easier to solve the problem.. why does this happen to me? and what can i do? -THANK YOU ALL SO MUCH!!

just be yourself and say what's on your mind, i'm sure that's all he wants. don't hold back your thoughts or feelings, if you've got something to say, say it! if you just keep quiet, it'll get worse, trust me. i've gone through something similar.. and my bf has trouble opening up to me cause idk what to say most of the time and feels i won't be able to support him emotionally.. but yea trying to change that. JUST DO IT. you care TOO much about what he has to say that it affects you and stops you from sharing your side. don't let him have this control over you, be strong, it won't go wrong if you do :) take care.