Dear
Welcome to HCM
We understand your concerns
I went through your details. I suggest you not to worry much. You should rethink and ask yourself whether concentration problem exists with you or not? If you are able to watch an interesting movie continuously, if you are able to play a game continuously without loosing concentration, if you are able to talk to your friends continuously, then you do not have any concentration problem. Concentration is attention and attention depends on so many factors like mood, circumstances etc.
You are unable to concentrate on so many things because of lack of interest, not because of low concentration level. Cultivate interest and you shall have concentration.
There are certain tricks and exercises to improve concentration. So many of them are available in internet. But it is your mindset, that you should change.
If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some
psychotherapy techniques which should help you cure your condition further.
Hope this answers your query. Available for further clarifications.
Good luck.