How do I get rid of the voice that is in my head?

Hello, I’m 16, I’ve had a voice since I was about 8. I don’t know how I got it, I think I may have gotten it when I was trying to get pregnant with my sister and it just kept getting louder and louder. It tells me things to make me feel good but it also makes me feel bad. It says I’m ugly, it says I’m going to die, it says I’m not worthy and I don’t deserve love. I also have anxiety, OCD, and depression. I have talked to my mom and I’m going to a therapist next week. But how do I get rid of the voice that’s in my head? I’ve talked to it, I’ve begged it to go away, and I even talked to it when I was about 10, but I still have it. I want to know what I can do to make it stop. I have also talked to my school therapist. I have talked to my parents. I’ve talked to my friend. I have done everything I can think of to make it stop but it still is here.