Your friends are the ones who were still there
The 11th house is where this Capricorn Venus makes its choices, and it chooses on the basis of who lasted. Your friendships were not formed by liking somebody quickly; they were formed by a person still being present after several years and several difficulties.
The result is a small circle of extraordinary durability and almost no recent additions. That is a defensible arrangement and it has one structural weakness, which is that a group assembled entirely by attrition has no mechanism at all for replacing anybody.
Groups joined for a purpose, not for company
You do not join things to socialise. You join because there is something to be done, a professional body, a committee, an organisation that needs running, and you end up doing considerably more of the work than anybody who joined for the company. Choose deliberately, since you will give whatever you join far more than it asked for.
The one everybody expects to organise it
In any circle you become the person who holds the arrangements, chases the details and makes sure the thing happens. Nobody assigned this and everybody depends on it. Hand one of these over entirely, and let it be done worse, since the expectation grows quietly for as long as it is never disappointed.
Slow to be counted as a member
You take years to feel that you belong somewhere and you are frequently regarded as a full member long before you consider yourself one. That gap is invisible from outside. Ask somebody directly where they think you stand, since your own assessment has consistently been the least generous one available.
Ambition for the group, not only for yourself
Where you commit, you want the thing to become substantial: properly run, respected, still there in twenty years. That seriousness lifts whatever you join. It can also make you impatient with people who wanted a pleasant evening rather than an institution, so establish which kind of thing you are in before reforming it.
The friendship that took a decade to change
Romance for you frequently begins as a long acquaintance that shifted quietly, sometimes years after both of you first wondered. That is a sound foundation and a very slow one. Say something once rather than waiting for a clearer signal, since your usual method has already cost you at least one possibility to somebody else's timing.
You do not do maintenance, and it costs you
Your friendships survive without contact and they do not grow without it, so the relationships you value most sit at the level they reached some years ago. Put two of them in the calendar as recurring appointments, since the affection is not in doubt and the mechanism for expressing it is entirely absent.
Who takes over when you stop
You end up running things, and whatever you run tends to depend on you personally, which is both a compliment and a design fault. Nothing you have built should require you in order to keep going. Train a successor in each role early and visibly, since the alternative is being unable to leave anything you made without damaging it on the way out.
Something in your life that is not the career
Almost everything you belong to has some connection to your working life, which means your sense of yourself has one source and no backup. Join a thing with no professional relevance whatsoever and stay in it for years. The activity hardly matters; what matters is having somewhere you are known for reasons that will still apply once the job has ended.
You are the one people ask to lend
Friends approach you when they are short, because you are visibly the solvent one and you rarely refuse, and you are also most unlikely ever to chase a repayment. Decide before the next request what you are willing to give outright, since a loan you will not pursue is simply a gift with a grievance attached and you have made several.