Aries on the inside, Pisces on the way in.
Your sun in Aries (fire, cardinal) is the engine — what burns at the centre, what starts when you are at home in yourself. Your Pisces rising (water, mutable, ruled by Jupiter) 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 sensitive and tidal — that is the Pisces arriving first. Then they get to know you and discover the Aries fire underneath, which can be a surprise — the cool surface hid a hot core.
Reads as Pisces until you trust them; then Aries comes through. The cardinal-mutable mix means you starts on the inside while adapts on the outside — internal and external rhythms are different, which is its own work.