You are the one who keeps the group even
Because Venus sits in Libra in your 11th house, your attention in any circle goes to the balance of it: who is being left out, who is dominating, whether the quiet one has been asked anything. You adjust continuously and almost nobody notices you doing it.
Friendship for you is a reciprocal arrangement rather than an attachment. You keep a quiet account of what has been given each way, and a friend who takes without returning will eventually be dropped, politely and without any conversation about it.
Causes chosen on grounds of fairness
What moves you to act is unfairness rather than suffering as such: the rule applied unevenly, the group excluded, the arrangement that advantages one side. That is a coherent and durable motive and it makes you unusually persistent once engaged. Choose one and stay, since your instinct is to keep weighing rather than to commit.
Difficulty having a favourite
You resist naming a closest friend, partly from a wish not to rank people and partly because your attention distributes evenly by default. The result is a circle of equals and nobody in the innermost position. Choose one deliberately. Somebody has to be the person you call first, and at present the role is vacant.
The group's unofficial arbiter
When two people in your circle fall out, both come to you, and you can hold both accounts without either feeling betrayed. It is a genuine service and it is exhausting. Set a limit on how long you will carry it, since the arbiter is the only person in the dispute with no one to talk to about it.
A social life that needs an occasion
You are not the one who calls without a reason. Your friendships are maintained through events, invitations and arrangements, and they thin during any period when nothing is being organised. Notice that the organising is what keeps them alive, and either keep doing it or say plainly that somebody else needs to.
The circle brings you its romantic business
People tell you about their marriages, their affairs and their doubts, because you listen without visibly taking a side. You end up holding a great deal of other people private life. Decide in advance what you would do if two of them turned out to be in the same story, since improvising at that point is how a trusted person stops being trusted.
Shared costs, split with unusual care
You are the one who works out what everybody owes and makes sure nobody is quietly subsidising anybody else. Groups run better for it. Do the same arithmetic for yourself occasionally, since your instinct to keep things fair for others has never once been turned on the question of whether you are being fairly treated.
Friends who are held to family standards
The people in your circle are expected to behave well and are quietly assessed on it, which is why your long friendships are with people of real decency. That filter works. It also means you rarely forgive a serious lapse, so decide whether that standard is one you would want applied to yourself in a bad year.
You need people, and the right amount of them
Too little company flattens you and too much leaves you frayed, and your equilibrium sits in a narrower band than most people's. Notice which side you are currently on rather than looking for another cause, since almost every unaccountably difficult week here turns out to be an imbalance in one direction or the other.
Reciprocity, quietly tallied
You keep an accurate mental record of who has made an effort and who has not, and you act on it without ever discussing it. Friends who have drifted out of favour usually never learn why. Say something once before letting somebody go, since a fair hearing is exactly what you would want and is the one thing you never offer.