You can be very knowledgeable and “have the answers” that others are looking for, but until they know how much you care – how passionate you are about that topic, how interested you are in their well-being, how much you understand what it means to them – that’s when you win them over.
Just like in most things in life, it’s not about you. People’s first thoughts tend to default to thoughts about themselves. You can say it’s selfish, but it’s true. That’s why people tell you to be interested in others, to listen twice as much as you talk, to ask questions about them, to use the other person’s name in conversation…they want to know (or at least think) you care about them. If they believe that, you will earn their trust and then they will be more receptive to your “knowledge.”