Relationships require effective problem solving and negotiation. Whether it is a romantic partnership, sibling bond, or parent/child relationship, communication is key.
Stumbling blocks to successful relationships for many people (including extroverts) are often social anxiety and difficulty managing anger and frustration.
It is, however, very possible to attain valuable skills in all these areas, making all of your relationships more satisfying, joyful, and fulfilling. A healthy goal is to be mutually empathetic. The relationships in our lives then serve as a source of empowerment.