Depends on how much you can currently grow. Like some guys can grow a full beard at 17 if they wanted to, and others have little patchy areas where the hair doesn't come in, or can't grow any at all. For your age, a little bit of scruff is probably your best bet. Just give it a few days between shaves. It really will affect who you attract though. Some girls hate any and all facial hair, and others are suckers for a beard. Keep that in mind. Personally, it really depends on the guy. Some look better clean-shaven, and others can pull off that huge Grizzly Adams beard, haha. But generally for me, you can't go wrong with the 'I-didn't-care-enough-to-shave-today' look. =P
okay, for bigger more mascualne guys I like a bit of hair on the chin, but for the pretty ones, don't be scared to admit it if ur prettier, cause trust me, its better ... then smooth is what I like, jst don't go smooth down south if you know what I mean :PPP
You look like one of my close friends, so much it is scary. But anyway, he looks best with a well-kept 5 o clock shadow (if that's not too much of an oxymoron haha) I think anything else might overwhelm your face and make it look like your trying to look older!