is this narrow or average biteldtoid for 15 untrained

[GerbertJohnson]

measured it at 18 and a half inches with a sliding doorframe

 

[AscendOrRopemaxx]

dnr

 

[grungymallard97]

measured it at 18 and a half inches with a sliding doorframe

View attachment 3218782View attachment 3218785

Average

 

[StarvedEpi]

you can look up the average bi delt for your height you know

 

[aids]

You get plenty wider as you get older, don't stress too much. Knowing if it's good or bad isn't going to help you right now.
Stellar job blurring your face by the way.