Element - people do say 'it's shit' all the time on your threads.
And they say it until they've said it so much and it doesn't make a difference so they try to help you move on to living your life and you get upset/angry and you react negatively and suggest that people are bullying you or aren't suffering as much as you/have some life addition like children which enhances their access to services or compassion. Which is untrue and upsets other people.
There are people in the exact position that you are on this thread. They're telling you its shit, that they've been in pain or are still in pain. They're telling you a diagnosis of BPD can lead to discrimination. They're telling you MH services haven't been helpful sometimes.
They're also telling you what helped them. And you say you've tried it or it wouldn't help. And you're increasingly annoyed that they're suggesting it.
Element - listen to Lucys. As long as you keep saying 'it won't work, I can't..., I know...' in negative ways then you are not going to benefit from any kind of intervention and that may be why people don't consider that you would benefit from MH intervention.
To really engage in therapy you have to be able to say 'my view and the way I'm managing things isn't working because I feel shit all of the time'. So what I think isn't working so I'll give X a go with an open mind and if that doesn't help, I'll give it my best and ask what's next that might help.
And sometimes the way I react to situations or people is because of my ingrained and distorted views of the world and it's not my fault (due to early life experiences) that I think that or respond in that way but I'm able to see that is my reaction and not always the intent of the other person or the reality of the situation and I'm open to looking at why and how I come to that conclusion and I want help to understand and change that.
Right now, you're not really asking for help. You're wanting a very specific kind of response from an individual/therapy which may not be available and more importantly - may not be helpful for you in the long term.