Libra on the inside, Aries on the way in.
Your sun in Libra (air, cardinal) is the engine — what thinks at the centre, what starts when you are at home in yourself. Your Aries rising (fire, cardinal, ruled by Mars) is the door — the way you arrive in a room, the first read the world takes of you, the body you walk in.
Strangers tend to assume you are fast and bold — that is the Aries arriving first. Then they get to know you and discover the Libra air underneath, which can be a layered second read — they have to update their first impression.
Reads as Aries until you trust them; then Libra comes through. The cardinal-cardinal mix means you consistently starts.