Seeing a Therapist

Tomorrow i have a doctors appointment i plan on telling my doc i want to see a therapist ive had a lot going on lately and havent been doing to well its getting worse ive delt with this for years since i was a kid but i dont know if i can do it anymore ive always known since i was younger that evently one day i would see a therapist or talk to someone about it im trans but im not out yet i know how my family will react so i wann be in a good place to be able to handle there reaction and the aftermath that will come with it im just nervous about telling the doctor that i wanna see a therapist i dont talk about my feeling never have so this would be new to me. Just want some advice