Yes, I agree @MJG017 the coping strategies can definitely become ingrained and even though possibly damaging, there are difficult to change.
I think one reason is that you start using them automatically, before you are cognitively aware of them, once you become aware of them you can try to modify them, but sometimes it's too late, or becomes difficult to explain or change your response. Initially, you are not even aware that you are using strategies, but once it is pointed out, or you realise, then you can try to modify them.
I think with childhood trauma you learn not to trust people. This is hepful at the time, because it can prevent further trauma. Later on, even in times that are safe, you still don't trust, so you don't get close to people, you do not show vunerability and so cannot make deep connections with people.
It definitely takes time to change these behaviours and time, because you won't always have the outcome you have strived for, so you have to keep practising and that takes time.