How to make a choice for a high school?

Ok im in 8th grade and going to 9th and i cnt decide what high school to go to. the school im in just added 9th grade last year and is continuing to add grades every year and all my friends and teachers are there and i really like the enviorment and its pretty nice but, i want to be a doctor and this school doesnt have any medical classes. Then theres the medical magnet high school if i go there ill be starting fresh which is a double edge sword i wanna change and start fresh but it takes time for me to make friends and im very shy but this school has medical classes and 2 of my cousins go here . I dnt know where to go Pls help thanks :)