Believe me there are some in-laws who think their daughter-in-law is too quiet, too reserved, etc.
People have their OWN preferences for socialization. Some prefer individuals who are very outgoing, loud, and talkative. Others prefer someone who is more calm and introverted.
Bottom Line: **You can't and will never be able to please everybody. So you shouldn't bother trying. Just keep one thing in mind...the **GOLDEN RULE: ** Do unto others as you would have them do to you.**
Whether you are an extrovert or an introvert....while interacting with others....show respect, kindness, and be helpful. Avoid tactless comments, stereotyping, ridiculing, and gossip. Even during an argument, one can agree to disagree calmly. It's tough, but it can be done.
Asking this question is an indication that you want to make the effort to get along with your in-laws. It's just common sense. You'll do fine.