Jeff is quite shy and has difficulty meeting new people, making friends, and getting involved in many social activities. the coreys would not suggest that

The answer is "he strive to become an extroverted personality since his shyness interferes so much with his life."

The vast majority trust that an extrovert is a man who is amicable and active. While that might be valid, that isn't the full importance of extroversion. An extrovert person is a man who is invigorated by being around other individuals. This is the inverse of a self observer who is invigorated by being distant from everyone else.