And when I perceive anything negative from them I want to push them away because I think they're just going to throw me away for being flawed.
This is a great statement to work with/from. It's got a lot of stuff in it.
The part about perceiving anything negative: it's very good that you used the word 'perceive'. That is what it is - perception. And our perceptions are often only partly rooted in fact.
This perception is a big thing that drives the behavior you want to change (pushing away).
So, immediately inserting a manual stop - as Casey pointed out, literally walking away from that thought - is always step one.
Step two, most of the time, is some form of distraction, simply in order to stop it from persisting. Just as you said - it will keep running around in your head, otherwise. The only reason there are so many lists of different kinds of distractions is that they are almost like a persons fingerprint: we all have our own unique set, and the process of finding them does take a bit of time. They are also generally strong, medium, and light - depending on the kind of thought.
I know you said acronyms don't help. When I was first learning how to distract I used flash cards. I also had to deal with the thought, "I am a grown woman making a set of flash cards so I can deal with myself". That was an upsetting thought too. I will say, though, they helped me.
Do you know what your distractions are? Have you found any that can truly beat that thought out of your head, or are they not strong enough?
Part two is coming back to the negative thought, after you've gotten some time and distance. It will still be upsetting - but addressing it will help it shift.
The hard reality is that these thought patterns take time to work through. You're trying to get them to 'neutral'. You may have to encounter the same thought in various scenarios a hundred times just to get it to 'mildly upsetting'.
I'm not saying that to daunt you. Honestly - I've been struggling hard with a persistent negative thought for the last year, and writing all this out is going to help me. I am realizing I haven't been doing anything to address the thought, I've only been distracting myself from it.
Addressing the thought is what a 'thought record' is for. It's a worksheet. Doing it can be annoying as heck. Doing it can bring up other feelings: inadequacy, shame, despair, anger. I'm gonna bet that your day program will introduce you to them. It's important to have someone walking you through the process at first. And most important: remembering that you are not going to change your mind very much on the first, or tenth, or twentieth. But I swear, it truly does work if you can just stick with the process.
OK, so that was a number of paragraphs just about the first part of your thought. This is a good example of what is really meant by taking a small chunk.
The second part - throwing you away because you are flawed - is core belief territory. In PTSD/CPTSD, core beliefs were often formed or reinforced by the trauma. Doing the trauma processing work is (I believe) an essential part of challenging and replacing those core beliefs. They simply don't shift without it. I can write more about that if it would be helpful, but am yammering on long enough at this point.
Part of my problem is that I don't know how to even meet people anymore. I don't know how to socialize on more than a superficial level. I don't know how to build a friendship.
I really identify with his. Like ragdoll circus said, friendship takes time. And it's hard to believe it's even worth being patient when you have gone without it for so long. But you will probably find that, once you are working on addressing the negative thought, it will seem more possible to tackle the challenge of putting yourself in situations where you will interact with people.