Shakes in the morning doesn't sound like a good sign.
For myself, I just know that it startet a bit like that, then the symptoms got worse and worse for the next few years. I'm 23 now but I allready have healthissues because of drinking that means I can probably never drink again safely.
Had I realised what road I was heading down when I was 19, I would have stopped drinking earlier, before I crossed the line and went to far.
I definitly think that you can be dependent on alcohol at the age of 19.