Headace , no concentration. Thoughts.

I was good at study, and very bore type person always in tension about future due to my study my background , as result i somehow pass it with good percentage ,but as i get min Marks in cet i start missing interests , i get admission in engg, and i get 3-4 backlogs in 1 sem and in 2 nd semester i clear all, but it happened same in 2 nd year engg. and iget backlogs again in 3 semester ,and due to tension i yeardown in 2nd year . then i try but i cant get in beacause my tensions ,i wasn't able to fill exam forms and i wasted my 5 years to get in , and now am in 3 rd year , but same happening with me due tensions stressed , i am not able to concentrate on study , as soon as exam get near i lost my concentration my mind full of thoughts only. i again got backlogs in 3rd year and now i am facing same problem of stress ,concentration headace ,mind full of unuseful thoughts .