Lifehack.org lists the top ten reasons to being an Introvert. As an INTJ, I can relate to these.

10) Work Well With Others, Especially In One-to-One Relationships
9) Maintain Long-Term Friendships
8) Flexible
7) Independent
6) Strong Ability To Concentrate
5) Self-Reflective
4) Responsible
3) Creative, Out-of-the-Box thinking
2) Analytical Skills That Integrate Complexity
1) Studious and Smart

Looks like I need to buy The Introvert Advantage.