Hi, I can understand the cause of your concern. Difficulty in registering things and in return not able to recall things can be due to many causes. At your age, I would like to consider options of anxiety and stress. It is quite common to have a loss in concentration and attention which results in memory disturbances if we are stressed and preoccupied with certain things. Anxiety disorders as well as depression can also lead to such symptoms. I would suggest that you consult a psychiatrist for detailed evaluation of your symptoms and get treated accordingly. In addition, try exercising daily. It will help you relax and hence able to focus. Hope that I was able answer your query. Best wishes for a speedy recovery.