Generally for admission in BMM course, 50% marks are required at 10+2 level. Therefore for actually getting admission in BMM course, the author will have to at least fulfill the eligibility criteria. In case the author is serious about completing the course of his dream, he should work hard and clear the 10+2 examination with a very high score which may compensate for his failure in 11th standard once.
After completion of the BMM course, the author may find an opportunity to work in many fields including advertising, journalism, radio, print/electronic media and theater etc.
Regarding his weakness and shyness, the same are likely to get overcome during the study in BMM course after getting admission on scoring high in the 12th standard.