What's wrong with my brain?

There's NOTHING wrong with you my friend. We each have our own way of interpreting language and speech. We are individuals, each our own, everyone makes different neural pathways that allow us to construct sentences and communicate to one another in a different way.

What I normally suggest to people with problems of communication is to talk more, to communicate with friends, family and strangers more often. It may sound strange, but it does help - I can assure you.

Some would say what you have is a gift, a lot of people speak before they think - and often what they say isn't all that good. Look at it this way my friend, it's better to be able to speak partially in a somewhat pleasant manner than to speak in full as a fool.

One opinion: anxiety, which has become a feedforward loop (you stumble over your words once, then the second time you're more anxious, etc.).

Talking more slowly in conversations might be helpful. Also, not pre-thinking your words might be a good exercise. I.e., alternate pre-thinking and not-pre-thinking conversations.

Source: Emotions: Transforming Anger, Fear and Pain, Marilyn Barrick, Ph.D., http://www.spiritualpsychology.com/

I feel your pain, this occasionally happens to me, the best method to help eliminate this problem is to constantly practice speaking to others or even in front of a mirror and eventually you will no longer have this problem.

sounds like stupid to me