Shaving has no impact on facial hair growth (or any other hair for that matter). That's all old myth.
At 19, your beard may still be filling out. I know mine wasn't fully developed then. By about 20-21, mine was fully filled in.
Also, not all guys can grow a full beard, and that's normal too. Its all genetic. If your father has a heavy full beard, you probably will have one too. If not, you probably won't.
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