Capricorn is ruled by Saturn — the planet of structure, time, and consequence. You came in with a project: build something that endures. You're patient on a timescale most people can't hold. The pop trope of "cold Capricorn" misses what you actually are: a long game artist.
The shadow of Capricorn is workaholism that becomes self-denial, and a defensive coldness that pushes away the warmth you actually need. The mature Capricorn has learned that the mountain isn't the only thing — the people you climb with matter too.
You'll recognize yourself in Capricorn if you set ten-year goals as a teenager, if you find sympathy easier to give than to receive, and if you have a quiet certainty that everything you're building is going somewhere.