Another favourite past-time of Western-privileged-folks: waxing poetic about subject matter they have no acquaintance with outside of internet articles and forum comments.
Regardless of contrasts with "more serious" psychological or physical illness, ADHD is debilitating without treatment and destroys the suffer's quality of life.
First thing that occurred to me while reading OP's post.
Your symptom list is accurate. I'm ADHD and can account for all of these traits, save for alcohol abuse (I dislike alcohol in general and only typically drink Scotch, on occasion, and socially drink with co-workers).
I'm 26 years old. I started my career in computing doing tech support. For at least a decade, I've been aspiring toward this ideal of "becoming a programmer".
What worked for years was convincing myself that I still had plenty of time and my lack of progress could be attributed to [excused by] my upbringing. I grew up in South Africa and was forced into the role of "man of the household" from 14 onwards. Started working full-time at age 15 (at an internet cafe, where I discovered some new vices called "starcraft" and "counter-strike").
I did not go to high-school. All that I am and all that I know is a product only of self-guided interest and study. My little job at the internet cafe granted me the gift of access to the internet after hours. After hour study sessions led me into a career in support and IT beginning at age 16.
Fast-forward 10 years and I'm in, essentially, the same position I was in at 16. I'm still in support, making a pitiable salary. I'm still struggling to manage basic essentials (chores, paying bills on time, getting to work on time, study, motivation), addicted to computer games and in a relationship with someone that I cannot stand.
What ADHD does that's so evil is that it both incapacitates you (unless you have a gun to your head - hence why I was able to pick up IT skills on the job) and blurs your sense of "real-time". The moment you allow yourself to baulk, procrastinate and so on, you essentially box yourself in more and more.
Recently I started amphetamine treatment. So far, it has had a fundamental impact on all aspects of my life. I've picked up SICP and I've started my journey. It's no miracle drug and I am struggling at every turn, but it had made focus-management easier. If you find yourself nodding at the symptoms list get diagnosed as soon as possible.