Being an introvert has nothing to do with your studies, and let me tell you, a lot of the students from top-tier colleges are introverts.
You can focus on developing your English, but as far as practical schools and placements are concerned, this will help you. You can talk to your batch mates in Hindi as well but for your academic and career growth, knowing English is paramount.
A few people in my batch were introverts and shy and did not speak English but over the course of a few months, they have changed with the way they behave, languages they speak as well as their looks.
If you are willing to adapt to your environment, you will definitely be able to survive and finally, your overall success will depend on your hard work.