You built something. It took years. By almost any external measure, it worked. And now you are standing inside it, looking around, trying to understand why it feels like someone else's. This is not a crisis of success, exactly. It is something stranger: the discovery that you have been very competent at building something you did not actually want.
Three thinkers on the Consilium roster would each name what is happening differently, and what, if anything, to do about it.

James: the self is not fixed
William James was one of the first thinkers to argue systematically that the self is not a thing you are but something you do. Identity, in his view, is a set of habits, dispositions, and choices that get reinforced over time until they feel inevitable. But because they were built, they can be rebuilt. The person you are is the person you have been practicing being. That is both the problem and the solution.
The greatest revolution of our generation is the discovery that human beings, by changing the inner attitudes of their minds, can change the outer aspects of their lives.
James would not be particularly alarmed by your situation. He would say that the feeling of having built the wrong life is also information. It tells you something about what you actually value that the process of building could not tell you. The question is what you do with that information. He would be interested in what small practices you could start, now, that point in a different direction. Not a dramatic reversal. The gradual recalibration of habit.

Machiavelli: fortune can be met
Niccolo Machiavelli wrote extensively about the tension between fortune and virtue, by which he meant the circumstances you inherit versus the qualities you bring to bear on them. He was not a fatalist. He believed that human agency could shape outcomes, even in unfavorable conditions. But he also understood that timing mattered, and that the person who acted decisively when circumstances allowed would do better than the person who waited for perfect conditions.
It is better to be impetuous than cautious, for fortune is a woman, and if you wish to keep her under it is necessary to beat and ill-use her.
Machiavelli would have little patience for prolonged regret. He would ask what the actual constraints are, not the imagined ones, and where the real leverage points are. He would suspect that you have more room to move than you are giving yourself credit for, and that the feeling of being trapped is partly a failure of strategic imagination. He would push you toward a clearer picture of what you actually want, and then toward identifying the specific moves that get you closer to it.

Woolf: you need a room of your own
Virginia Woolf understood the difference between a life that has space for the self and one that does not. Her argument was not just about material conditions, though it was about those too. It was about whether the life you have built contains any territory that is genuinely yours, space that is not defined by your obligations, your role, the version of yourself that other people need you to be.
You cannot find peace by avoiding life.
Woolf would want to know whether the life you have built contains any such space. Not as a vacation or a luxury, but as a structural feature. If it does not, she would say that is where to start. Not by dismantling everything, but by carving out something, even something small, that belongs only to you. The wrong life is often not entirely wrong. It is often a life that has crowded out the parts of you that needed room to exist.
Where they pull differently
James would say: the self is made of habit, and habits can change. Start small, start now, and do not wait for a transformation to feel complete before beginning it.
Machiavelli would say: you probably have more strategic options than you think. The constraint is often less the situation itself and more the failure to look at it clearly. Look at it clearly.
Woolf would say: before you decide whether the whole life needs rebuilding, determine whether there is any space in it that is actually yours. If not, that is the first thing to fix.
The question underneath the question
Having built the wrong life is not evidence that you are broken or that you failed. It is usually evidence that you were good at executing on things, including expectations you absorbed before you had the self-knowledge to question them.
None of these thinkers would tell you the situation is easy to change. All of them would tell you that it is worth looking at honestly, and that looking at it honestly is itself a different kind of action than the one that built you here.