Harder to breathe

I am so freaking pissed off. I know I shouldn't have opened my mouth, I'm not biased enough to speak and agree with everything they say. Instead of disagreeing with me, you have to attack me, that's not how a debate works. Why would you think I would deliberately hurt someone? I wouldn't. You should know that, but apparently you don't. And now I am the bad person.
I don't want to lose family members over a disagreement, but I am not going to go back to being that person that let's others walk all over me, call me an idiot because I don't agree with them, or make me feel like less of a person so you can feel better about yourself.
I want to just move on. I want to move past this and not be consumed with all of this anger and pain, but I never learned how to just let things go. I've tried. I am not the person that I want to be, but every time I close my eyes, I go back to the confrontations, the disagreements, the betrayals and am reminded of everything negative. I don't want this heaviness to consume me anymore.