A Question for psychiatrists, psychologists and brain specialists ONLY.?

Before I ask, let me tell you that I guarantee I do not have a mental disorder or illness, learning disability or any of the kind. This question probably doesn't have anything to do with that. And please, I need a solution to the problem more than the cause.

I often feel like I cannot understand what's going on around me, though I really really can. I just think that I can't and that is what makes it seem so real. I only feel like this when I think about it, the belief that I can't think or understand properly. It's really confusing, right?

Here's my version of why I feel like that:

Once when I had a really bad day, and I was studying, I was too unhappy to study. After that, I made myself believe that I could not study properly and from there it went to believing that I could not think or understand properly. I believe that I have made myself believe that I cannot think properly, though I really can. I caused myself a fear of not understanding. How do I reverse this fear?

You are describing a cognitive distortion that has now become a self-fulfilling prophecy. You need to find examples of your ability to understand things accurately (and I'm sure there are many) and use them as a way to logically argue against the distorted belief you adopted years ago to explain a particularly bad day when in reality you were probably just stressed out and needed to find a reason to give yourself permission to take a break. Try using a healthier belief to explain a difficulty with concentration, like "I was just tired, overwhelmed, having a bad day" to replace the incorrect assumption you made that you have since adopted as true. It's called cognitive restructuring.
Cognitive distortions run rampant when people are depressed, anxious or overwhelmed, whether it is indicative of a disorder or just a temporary human condition that everyone experiences depends on the frequency with which it occurs and the degree of impairment it causes.

I think you have ADD! But, first of all, i am no doctor. I often have this same anxiety. try relaxing and listen to some classical music before,while or during your study time. It will help u if u listen to the music, take long, deep breaths, and do what u gotta do. the music will help u remember what u are studying too.
Secondly, quit looking for excuses. I can understand being unhappy because something traumatic has happened (i.e. death in family, u ran over the dog, getting into a street fight) But still u cant let that cause u so much grief that u cant function. that is ridiculous. People thrive on making people angry, and making themselves look better than u in the public eye. And while u are upset, stressed out, and ready to go hurt someone, that butt muncher is out having a GREAT time, not caring that u at home ready to lose your dayum mind! Or worse, ooooh, there's JAIL, which no one wants to be there! You need to change your focus, to U and only u, until u can get a grip.

Yes we are victims of our own postulates. But what is mess up is that admitting that your old postulate was wrong makes you be wrong. And we don't want to be wrong. So we have a problem of postulate against counter postulate and this equals confusion (it is vs. it isn't). After this confusion where is your reality left? You already admitted that you were wrong. Reality is certainty but how can you have any certainty when you already doubted your self.
Well truth be told you did this to yourself and only you can undo it. Is not easy, but you can increase your reality by increasing your communication. Stop figure, figure, figure and get involved with life. Yeah I鈥檓 a scientologist I鈥檓 sorry to butt in but I don鈥檛 think that a mental health professional will have a clue what the heck are you talking about. They will probably say that you have a chemical imbalance, that鈥檚 how ignorant they are.