I'm 16 and spent 6 months building an AI group travel planner — What should I know before launching?

Hey PH 👋

My name is Nicolò. I'm 16, from Italy, and I've been building SplitPlan — an AI-powered app that takes the chaos out of planning group trips.

You know the drill: 8 people, a WhatsApp thread that won't die, a Google Sheet no one updates, and someone who "forgot" to Venmo you back. We've all been there.

SplitPlan uses AI (Gemini) to generate destination proposals based on everyone's preferences, runs a group vote, builds an optimized day-by-day itinerary, and handles expense splitting — all in one place.

I built the whole thing: FastAPI backend on Supabase, React 19 frontend, Stripe integration, the full stack. It's live at splitplan-ai.vercel.app. No users yet — just me, my brother, and 4 teammates trying to figure out how to go from "we built it" to "people actually use it."

I'm about to start reaching out for beta users and I'd love one thing from this community:

If you've launched a product before — what's the single most important thing you wish you'd known before your first real users showed up?