Size Concerns

i am a first time Beardie owner. owned my beardie for a little over a year now but he is only 14 inches. He eats everyday no lack of appetite, very active. I have no idea where i went wrong and I worry i screwed up somewhere. Can someone please give me any advice. Thank you very much. He had is most recent shed about 2 weeks ago.
Also i can't seem to figure out how to post a picture

*EDIT*
Recently Been feeding him superworms, and turnip greens once a day, have a 10.0 UVB 13 watt Reptisun bulb and a 100w 110v infared Heat bulb. Depending on the temperature in my apartment the highest point of his basking area, which he loves to sit, is anywhere between 95-110 degrees.
I did get him from petco which I know realize is not the best place to get them from.
Also did a little research and found that Petco typically has Pogona vitticeps, which can be anywhere from 12-24 inches. Don't know how accurate that is tho.

The size of adult dragons can vary but he is a little on the small size.
How many supers and how much green is he getting a day? Have you always fed him once a day?
He should be getting two meals a day and allowed to eat as many greens as he wants a day. I'd personally be feeding around 20 supers a day, see if the extra protein will help boost his growth.

Gail":1n7oddje said:

The size of adult dragons can vary but he is a little on the small size.
How many supers and how much green is he getting a day? Have you always fed him once a day?
He should be getting two meals a day and allowed to eat as many greens as he wants a day. I'd personally be feeding around 20 supers a day, see if the extra protein will help boost his growth.

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i feed him till he wont eat anymore, after his first 1 or 2 feedings of superworms he did end up shedding. when i first got him it was multiple times a day but due to my current job working 12+ hours a day monday - thursday i feed him in the morning.