How can I get my Medical Marijuana License?

I'm 19 years old, and the only previous medical records that show up for me are asthma. But I would like to use the reason of Insomnia, Depression, and Social Anxiety (which I really do suffer from).

How would I be able to truthfully convince a marijuana doctor to prescribe it to me?

: http://alcoholdrugstreatment.info/how-can-i-get-my-medical-marijuana-license