Do I have an abnormal body for a 13 year old?

Not at all, you also have to look at your own family genetics too, if you have older sister(s) or cousins you can always look at them as similar body types run in the family.

What your body naturally carries also varies from person to person too. Taking a look at people you know isn't always the best way to find a "normal" body. Though really, what is "normal"? If you're perfectly healthy and are having no major health issues then you have a normal body. Some may have larger breasts or smaller breasts at the same age, taller or shorter or carry more muscle or body fat.

If the girls you know are a little taller, by an inch or so, it really isn't that much to concern yourself with. As for your body weight, that depends on how much muscle you have too as muscle weighs more than fat but some people are naturally a solid/stocky build so tend to carry more weight.

Being only 13 you still have plenty of growing, so you'll have a few growth spurts and you may catch up to your friends too.

One of my friends, he was fairly short throughout his childhood, then once puberty hit, he shot up and is now 6ft tall, so you may be short now but you could end up taller than your peers too.

To gauge your own height at adult, take a look at your parents, most people will end up about the same or a bit taller than their own parents (though the older they get, they tend to lose a bit of height too once they get to 50's)

With your bust size, some families have larger chests running in their families too, so again, it may be worth comparing bust sizes with older siblings/relatives and your mother if you can.

You're fine!! And no, lost of girls your age have size B's and even C's! It's normal!! And you're growing. Trust me you;re fine!! Please don't think you're fat or anything or think your boobs are too big.

you are the exact size of my younger sister, and she is adorable, short and petite, you are just fine the way you are :)