1.
You're so inseparable, you think you may as well have been born conjoined twins.
2.
You occasionally gang up together on one of your "actual" siblings.
3.
You basically have your own language no one else understands.
4.
Because you tend to live in your own little world. (Particularly in public.)
5.
You totally don’t mind sharing the bathroom with each other, because between you two, there are no boundaries.
6.
You borrow each other's things so often that it feels like they belong to you anyway.
7.
You're at each other's houses so often, your families treat you like one of their own.
8.
When you start seeing a new guy or girl, your biggest concern is that your BFF will approve.
9.
You know each other's pasts so well you start to think you were by each other's side from birth.
10.
You ask for your BFF's advice before your own family's.
11.
In fact, when anything goes wrong, your BFF is always the first person you talk to.
12.
Gossiping is EASILY one of your favorite shared pastimes.
13.
There has been more than one occasion where you dressed the same, because OBVIOUSLY you share the same brilliant mind.
14.
Your family trips often feel pointless without each other.
15.
Your own parents have actually had to referee fights between you two before...
16.
...and you immediately made up afterwards because you legitimately felt bad about what happened.
17.
You actually know each others' interests way better than their own family.
18.
Other people find it weird when they see one of you apart from the other.
19.
And finally, you question whether you two were ~actually~ sisters in another life because you can't imagine any kind of life without each other.
