Yes you are valid. There is a microlabel that you may relate to, if you’re looking for it:

Reciprosexuals don’t feel sexual attraction until they know someone is attracted to them first. This can create a dynamic where attraction follows mutual interest rather than leading it, different from most other orientations.

But ace is ace is ace is ace. If you identify as being on the ace spectrum, you are valid. If you change your mind later, you were (and are) still valid. You do you boo.