Congrats on getting selected to IIT. It in itself is a big achievement that many people dream of.
Is this college club in your IIT college or in current university? If you try then only you will know whether you like talking to people or not. If you absolutely do not like that activity at all, tell them that I can be observer and learn how to do it. Talking to people is something that we will need even in future once you land in job, so it is a good skill to acquire. Slowly you can learn from seniors. I always suggest my juniors to follow their immediate seniors. Those are the best mentors you can have while doing bachelors .
All the best and Yaaay! you are going to be IITian. Celebrate and Enjoy.