Hello V. Thanks for sharing your story. You have mentioned a few things. Drinking nightly alone and enjoying the buzz. You get depressed, are worried about your health, have noticed physical effects, have anxiety and are confused, your parents are concerned and you find it hard thinking about the alcohol stuff clearly.
Regardless of the term alcoholic- I suggest you seek the advice of your doctor. What you mention are certainly wake up calls. Before you know it- you will be 40.
Keep posting, PJ.