Well, I suppose one way of finding out if you're an alcoholic would be to try some moderate drinking and see what happens. If you're unable to moderate, and the idea of stopping fills you with fear, then chances are that will answer your question for you.
Have you read this article about PAWS? I found it very useful.
https://digital-dharma.net/post-acut...r-immediately/
To be honest, all the tips for lessening the effects of PAWS in the article are ones that would stand any of us in good stead, alcoholic or not, so you'd have nothing to lose from creating an action plan, and trying these things to see if they do help out.
There is also some useful AA leaflets specifically about young people in AA. There have been younger alcoholics in AA than yourself, so these things are definitely possible. When I look back, the signs were there for me at 18 if I'd chosen to see them. To think I could have saves myself over 20 years of ridiculousness!! Doh!
Alcoholics Anonymous Northeastern Ontario Area 84 ? Young People and AA