Your thinking runs on a network
The Gemini half of your Mercury runs the 11th house, so ideas do not finish in your own head. Something occurs to you and it goes straight out — to the group, the thread, three people who will each say something different — and what comes back is the actual thought.
An unshared idea feels only half formed to you. That is a genuine method rather than a lack of independence, and it means the quality of your thinking depends directly on the quality of your circle.
Several circles, none of them entirely
You belong to a number of groups and are fully inside none, which gives you an unusual view of all of them and a persistent low-grade sense of being a visitor everywhere. Both are accurate. Notice that the people who feel central to a group usually got there by turning up more rather than by being liked more, and that the remedy is attendance rather than acceptance.
The thread is a working instrument
A good group conversation is not a social nicety for you, it is equipment: where things get worked out, connections get made and half your professional and personal opportunities originate. Treat it as such. Curate who is in it, keep it alive during quiet periods, and notice that the effort you put into it is work rather than distraction from work.
You know who should meet whom
Across your scattered circles you hold a map of who is good at what and who is currently looking for something, and two messages from you can unstick a situation that has been stuck for months. Do it on purpose rather than by chance: once a month, look at who you have met lately and ask which two of them ought to know each other.
Commitment is the deliberate act
Nothing about this position produces sustained membership by itself — you can maintain twenty light connections indefinitely and never be indispensable to any of them. Choose one group and be the person who is always there for three years. The difference between belonging to many things and being load-bearing in one is entirely a matter of decision.
Wide is not the same as deep
You have more connections than almost anybody and the question of who would actually turn up is separate and unanswered. That is not a failure of your social life; it is the trade-off of its particular shape. Pick three people and invest disproportionately in them over the next few years, and let the rest stay exactly as light as they are.
You need them inside the same conversation
What makes somebody a candidate is that the group talk is better with them in it: the reference caught and returned, the thread that runs for three days, the argument you both enjoy having in front of other people. A partner who wants you to themselves, away from all of that, is asking you to give up the medium the attraction was running in. Say that the circle is not a rival before somebody has to work it out for themselves.
The tip came from somebody in a thread
Financial opportunities reach you socially rather than through research: the thing somebody mentioned, the arrangement a friend explained, the option you heard about before it was general. That is a real advantage and it comes with no filter attached. Apply one of your own — never act on anything the same week you heard it, however good the source.
You are the connective tissue
Several of your groups exist in something like their current form because you keep passing information between them, and none of those people know that. It is genuine infrastructure and it is unpaid and invisible. Notice how many hours it takes, and let one of the arrangements lapse without rescuing it, purely to find out what happens.