I struggled with this myself, so much so my pediatric GI specialist who served also as my PCP kept me for over 2 decades because I was so terrified and unwilling to transfer to adult care. However, when I started to make that transition my pediatric specialist contacted my new adult specialist prior to my first appointment to provide them information about me and my health, my concerns about transitioning to adult care and she maintained communication with my new adult specialist so that she was apprised of my health and treatments received. This helped me feel more comfortable, while she was no longer directing my care, she was aware of it and could recommend changes if needed until I began to feel comfortable with my new adult specialist.