Are people who have boderline personality disorders also stupid? DO you know anyone?

I cut, misinterpret things, can be incredibly slow, people get the wrong impression of me ALL the time. I have the LOOK of an intelligent, confident, attractive woman, but underneath all of that I am something completely different. Once they get to know me, they back off and are greatly disappointed. Never set your expectations too high. For a long time I can be this wonderful person, and it is real, but then the other person comes to take control.

Having BPD has nothing to do with your intelligence. I know of several people who struggle with BPD who are extremely intelligent, far above normal.
The problem with people who have BPD is that they have not learned how to manage emotions - an early, early childhood thing that didn't happen. So, they can function very well in structured environments (like at work), but fall apart when emotions become intense (like in a relationship). Basically, when an intense emotion is triggered, it takes over, and the rational mind has no ability to intervene. People with BPD also fear abandonment, which probably also comes from something in early childhood.
People can heal from this. It's all about learning to work with emotions in a way that's constructive.

No, not stupid at all, unfortunately having borderline personality does frighten people off as they get to know you. If you're not hurting anyone, including yourself, then stop worrying about being accepted, learn to accept your condition and only befriend those who support you, I would anyhow, cheers.

yes, ME

Well, I have to say that in general, MOST people look more confident and competent and in control than they really are.

I don't think borderline personality disorder tracks with IQ much at all.

If by stupid, you mean that you have behavioral problems and misinterpret a lot, there is training for that, called DBT or dialectical behavior therapy. They teach you all that stuff, and it is supposed to be the most helpful thing around for people with borderline. Look it up! It is a long commitment, however.

Good luck! It's ok to feel dumb, but you gotta pick yourself back up and remind yourself that everyone does dumb things once in awhile. You just have different dumb things that you do.