Therapists can take you places your friends can’t go. The relationship you have with a therapist is a professional association with someone who supports you based on your own agenda.
Therapists train for many years to listen to and help people who are in distress. They deal with their client’s trauma as well as the mundane trials of the human condition. They are trained to be emotionally and mentally present. They give thoughtful feedback about problems that would worry or even frighten a friend. They keep confidentiality. They don’t have an agenda based on a personal relationship with you.
A therapist’s only job is to help you grow.