Why would a psychiatrist prescribe antidepressants to a 14 year old?

I really need an elaborate answer. I was a victim of an extremely careless doctor who prescribed SSRI medication to me at only 14 years old. Because I was still physically and mentally growing, putting me on medication has created so many developmental issues I still suffer with into adulthood. I am so bitter and angry she did this to me. So I need to ask you... WHY would she prescribe dangerous medications to a literal child? There are sexual, cognitive, gastrointestinal and so many more side effects I suffered, and there's no way she didn't know about these side effects.