From a newly diagnosed ADHD person, many doctors I have seen have said its very probable. I was diagnosed with Depression over a year ago, and then dropped out of university because of it. I recently got a psyc evaluation and I was told I have adhd and that is the cause of my depression. I never wanted to do anything because it was boring as a younger kid then that turned into me not doing anything at all because I just wasnt happy from not doing anything. Im not sure how to say it, but I am living proof that what you are speculating is happening to you has already happened to me.