Hi I’m An 18 Year Old Female, Who Suffers With

Hi I’m an 18 year old female, who suffers with major depression, anxiety, and insomnia. My I think I need a brain scan but not really sure. I can’t remember much about my childhood only some small things like what happen atleast 2-5 years ago but that’s like on events like Christmas or my birthday. Other than that I can’t remember anything else prior to my childhood maybe one or two things that’s about it. Could you tell me what could be wrong and if I do need a brain scan?