Well, that's easy: you're not the problem, that's very clear. You're putting up with dismissive behaviour because you've been trained to, that's all. You keep looking to yourself to see if you're the problem, and that's your only mistake. If you want empathy and understanding, why not give it to yourself?
Your heart has been screaming to be heard all your life, and she's still trying now. She's posted here, looking for understanding, but you're asking 'is she a problem? Is she making all my relationships a problem?'
Imagine if you said that to a child: 'I think you are the problem, whenever things go wrong' Can you see how damaging that would be to the child? You're doing that to your own heart, when already, nobody has ever really listened to her.
You're not going mad, and you are not the problem. You are mixing with people you don't feel happy around, and finding fault with yourself for not feeling happy. This is fixable... I've not been where you are, but I've been somewhere similar. It can all change.