My impression of the 11th house -- A Sun in the eleventh says you can't be you unless you are a 'member' somewhere. You've 'joined' a group. You are part of a team. You see yourself as part of group. You identify with what a group can accomplish, not just you alone, or you with a partner, or you with family. As a member, you have a sense of 'belonging'. You see yourself with bucket list of things to do with groups of people. They are projects, one cannot do alone. You exist to be 'social', as in mingle with people. If work ever forces you into going without social experiences for days on end, you go nuts, or miserable.
People like you can find they have a better ability than others to function in large organizations, because you can identify with the needs and motives of the organization, and thus know how to maneuver within, and not lose your own sense of self.
Or you may have a sense about what drives politics, or other collective sciences about people.
With Mars in the 11th, near Sun and Mercury, you should be able to focus energy in that collective, to achieve goals which set you out ahead.
There's an interesting twist to absorb in the 11th house interpretation, which sets it apart from the people mingling tendencies of houses 4 through 9. There's a division of the chart East vs West half (houses 10 through 3, vs houses 4-9). On the east you operate mostly on your own, where as on the other half the chart, there's a need for you to work with/for others. So there on the 'solo' side of the chart is this social collective house. Why isn't it on the other side of the chart? The people connection in the 11th house are a bit 'impersonal' in comparison to those on the other side. In the 11th it's about what "we can do as a group" or "what a good member should do", with no spotlight on the case of just one individual. You may find you are short on tolerance for those who ask for 'special treatment', or to be excused from routine responsibilities. That sort of behavior is not good for the 'group'. It's not to be tolerated. Putting up with that is what corrupts the integrity of the group, says the 11th house person.
Another way to look at the 11th, is to move around the chart House 1 through 12, and see how the sequence of activity flows. 4th is family 5th is children or romantic love. 9th is higher education. 10th is graduation, getting published, becoming known. So what would the 11th be, just before the 12th? It seems to be about accomplishing what you could not do with with just the prior houses - family, children, education, notoriety. Plug into the collective. (Not necessarily the cosmos.) Join league with people of similar interests. Push the envelope on what is known, or done, by pooling interests, will, and effort with others. Make a difference. Perhaps.
So does this agree, disagree with what others think the 11th house is?
Does this help you understand yourself Magnolia?