You are 100% valid.
Asexuality is a massive spectrum, not a narrow box. Most of us see Ace as a big tent that covers anyone who experiences attraction differently, rarely, or only under specific conditions. It isn’t an all or nothing thing.
What you described, needing a romantic bond first, is the core of demisexuality. And that bit about only feeling it if your partner is “sexual first”? That’s actually a specific thing called reciprosexuality. Both are widely recognized and respected parts of the Ace community.
One thing that helps a lot of people is separating attraction from action. You can participate in sex for curiosity or romantic intimacy and still be asexual. It’s about that internal pull (or lack of it), not the act itself.
Labels are just tools to help you navigate your own life and find your people. They are not cages you have to fit into perfectly. If calling yourself Ace or Demi feels right to you now, then it is yours to use.
This is just a reminder that the current proposed budget cuts NASA’s budget (again) by 23%.