hiya,

do you know of anything that triggers the inability to concentrate? It could range anywhere from studying at home with a lot of distractions to having horrible associates with school related stuff because of bullying or even the way your parents had you study.

From what I've learned, concentration issues are easily labeled as an adhd issue, but depression also makes life hard to focus on. I'm not suggesting you have depression, but rather that maybe current life events are triggering some past trauma or conflict somewhere-thus the anxiety.

Another note here...you mentioned karate; that's an aggressive activity there..but I notice that you said it's what makes you happy. Well, depression is also considered to be "anger turned inward" upon oneself...
you said

"I can't concentrate and it makes me angry at myself".

I feel that you have a lot of anger, and maybe you wernt always allowed to express that as a kid without being penalized. The karate allows you to get some of that anger out. Well, my guess is from an analytical approach-you have reasons to be angry, and the thought is that if you talk about it, relive those times in hardcore detail, cry it out-you won't spend so much energy holding back your anger, because you would have released it through getting some validation through others. A lot of the time we don't even realize that some of the things we went through as a kid are not "normal"...like a mom that guilt-tripped all the time or more extreme examples.

Hope that helped, take care