Body hair has nothing in common with facial hair, they're people with thick chest hair and no beard but also no chest hair and thick beards. The hairs on your face look transitional you also have quiet a bit of vellus on the cheek area too that's a good sign. No one can determine how long the change from vellus to terminal can take, as it's taken as little as a year for some people then other people its taken up to 15 years no one knows also don't forget that you're still really young beards can still develop in to your 40's.