I just turned 14 and still have pretty small wrists. I was trying to justify buying the 42mm on my wrists which are 150mm in circumference and 50mm in width so that I could get a leather loop. The combo down here is what I pre-ordered with a June delivery date, the 42mm black sport with a separate bright blue leather loop.
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After looking at the real size photos again on the Apple Store app though, I decided to go for another try-on to make sure I made the right decision. The lady helping was super nice, but gave me the wrong advice and said the 42mm looked fine on me.I believed her and kept it.
Then, yesterday, when I was at the mall and a friend wanted to go to the Apple store to see the Watches, I tried them on again and finally decided that the 38mm was the right one for me, which I should have known from the beginning. Sorry I don't have a picture, but I canceled my order and ordered the 38mm SS with the white sport band, which the Apple guy assured me wouldn't get dirty.
One of the other things that was keeping me from the 38mm too was that I was growing and I thought I would grow out of it, but reading this thread makes me realize that the 38mm might even still be the right choice in 2 years, so thank you!
Now I've got a May 21-June 4 delivery date, too, though, so that's good!
To all of you, though, don't let the bigger screen size or access to the leather loop band cloud your judgment. First thing is making it look good on you, size-wise. If you ordered either one and are having doubts, go try them on again at the Apple Store and have pictures taken of your wrists from close and far away. It helps.
I was in a similar boat as you (except much older). I assumed 42 would be better and my wrist is bigger then yours, 185. So I only planned to try on 42s, but I felt like they were slightly uncomfortable so I tried a 38 on. Instantly more comfortable, sales associate told me 42 was better because I'm a guy and I shouldn't even consider a 38 at all. But after the try on the only thing holding me to the 42 was leather loop band. Eventually I figured comfort is more important then band and hopefully Apple will come out with a 38 leather loops or more "professional" sport band colors.
Of course I could always go cheaper with 3rd party.