I meant I don't think you are an IT, and I'm willing to argue it. And I was just teasing that my best friend would tease me and call me 'fat cow' for arguing

Ahahah okay
Thank you very much

Hi, Dana. You have a lovely figure

I'm sticking with one of my previous guesses: your shoulders are not broad/large, they just have a well defined shape. I really think defined shoulders look gorgeous in A-line halters and tops with a V string/line coming out of its center, but if they really bother you, there are some tips to make then look smaller:
http://www.insideoutstyleblog......lders.html
(this blog has an article about how to broaden your shoulders, you may look there to see what to avoid too)

About your body shape, from your mearurements I would expect your hips to look larger and that's not the case at all. Your chest and hips look well balanced. I still think you are primary a column, but with something of a neat-hourglass too.
In the link above there are sections about body shapes. I believe you may use above tips to make your shoulders look smaller along with I-shape tips to create a slender figure or you can show off/emphasize your shoulders and go for some V-shape tips to create a more X-like figure.
Note that you are not really an inverted triangle/V, but you can easily create the visual illusion of larger shoulders because their well defined shape, so you can use it to your advantage and get more outfit options

So I'm not IT, but I can look like I am because of my shoulders? Is it because they're "square" :)?

I think "square shoulders" are a lot more angular, they create literally square/perpendicular lines. Your neck-shoulder transition is smooth and your shoulders have beautiful rounder form actually. I will use an exaggerated example to explain what I mean (I'm not a native speaker too).
In this photo Cameron Diaz is thinner and more muscular than usual. If you look at her shoulder-to-arm line (along the vertical white line) you can see her shoulder form and her arm form easily, right? There is a ")" form around her shoulder and a visible meeting point between shoulder and arm. This is what I mean by "defined shoulder". Yours are not that muscular nor exaggerated, but I can see the actual shape of your shoulders and the point where your shoulders and arms meet (it's visible in a good way). If you look at my arm that same line looks flat. Note that my arm if flexed in this photo - I was carrying a coconut - and there is no more than a shadow of a shoulder or arm visible. My shoulder/arm is by comparison "undefined".

It's not that you look like a V, but since you have well shaped/defined shoulders you can show them off and make then look larger on purpose easier than a girl with undefined shoulders (you can do that to create a more accentuate X shape, but then you will need to use some V-shape tips to do the same with your bottom and keep everything in balance). Girls with undefined shoulder can make them look larger with some effort too, but we need to be extra careful to not end with fatter/weird arms instead of larger shoulders

Okay thank you very much! You've really helped me

So, I'm an IT and have come to like my shoulders - models often are ITS so clothes will hang properly. One clue for me is that when my arms hang straight, the don't come close to touching my hips. But you are very young and still have a ways to go developing - so don't focus on that. You look very proportionate and not IT to me.

Okay, when I let my arms hang naturally they touch my hips
How long time do hips develop? I mean how long time do they grow bigger?

But I still kinda think I look IT