Your parents sound like classic narcissists or what I like to call "skin-balloons", because there's nothing in their body other than worms and false-egos. Most people have some percentage of narcissism, 1% all the way up to 100%. But you only need 50% or 60% for them to become "terminal" (meaning they will never recover, even if they wanted to, which they wouldn't at that point). It takes years of therapy to treat someone with this personality disorder. To me, narcissism is due to a lot of factors including their personality archetype, their life experience, and all the "induced currents" (other people) around them. What you are experiencing is a classic case of parental narcissism.
They are controlling, back-handed with their aggression (they hate your gf because they can't stand you being more happy than they are), and they insult you for your independence. See it for how it is. You are a victim here, take that Extremely seriously, it's no laughing matter. Google "narcissistic parents and how to heal". Read up on other's experiences. You will see just how broken those people are.
"...they were always super critical of me it felt like poison to me." <-- this is CRITICAL information. Narcissist slowly poison the one's they control. Their emotional circuitry is on the Outside. They Cannot work out emotions within them. They are broken in this regard so in order for them to deal with their emotions, they cast them out into the real world by "assigning" objects (or worse) other living creatures. Ever wonder how a parent could treat one of their kids like royalty while treating another like the absolute scum of the earth? This is how. They "assign" an emotion to their children, one child is their "happy place" where they can process "happy" emotions while the other kid is their "angry place". You can guess what the parents do to them from there.....
"This wiped out her entire person and turned her (and me) literally into robots that feel no emotions. That was some kind of attack." <--- Skin balloons have no "soul core" of their own so they must leech it off of genuine people. Usually they prey upon those with External Feeling functions. I've been in a similar situation before and it literally feels like the waters of your soul have evaporated, leaving you dry and barren.
"The next thing is that they think they are a victim because they chose me..." <--- Again, they are forever the victim in their messed up heads. Classic narcissistic behavior. The worse part about all of this, your parents probably don't even realize what they are doing is wrong. Most narcissists don't. They living in a "perfect world" where they "always win" and when they don't, they blame EVERYONE but themselves. This is because they have no internal cohesion. They are not "human" at this point, they have no souls and if they did, the soul is long gone. (This can happen when too much outside induced currents and parasitic overload can quite literally Push the soul out of the body. The bio-electro-magnetism of the body is now so far removed from when the soul first inhabited their bodily vessel that it is now uninhabitable because of the interference. How does this happen to some people and not others? Some people are born with a weak soul, that is why it is Imperative to pursue spiritual development of the soul because if you don't and allow your spirit to rot for life times... well... this is what happens.)
"...like super weird no emotions emptiness very forceful and extremely cold energy." <--- You saw them for who they are. Now, it is time to cut the tentacle attached to your soul and divorce yourself emotionally from these "fellow human-beans".
OP, your soul is great and powerful as you wouldn't be here if it wasn't otherwise. The healing will begin when you leave these people. Or it can begin right the fuck now, if you wanted. It will be very painful, I must warn you. You will probably be emotionally constipated and it will take you probably a year to fully "get over it", this is from my experience. But it is really important you get this out of yourself emotionally as emotions are stored in the organs of the body and if your emotions are all fucked up, those organs will not be able to transform Qi or even cultivate more of it. You become weak because of this. Imagine, how quickly you could now advance because you have divorced yourself emotionally from these "people".
You should see if you have picked up any narcissistic tendencies from your parents. Take a test online or go to a therapist and ask them to preform a "personality disorder test" on you. Children of abuse are often not "unscaved" by their abuser, and you should want to make sure that you yourself are okay.
I have hope in you, kind sir. And best of luck!