No. You are not a descendent of "celts" who lived what is now "France". Your culture wasn't lost. Any Celtic culture that might have been present in France in pre-Roman times has nothing to do with you or your ancestry. It was not "your" culture.
The Celtic culture in Brittany is not something that survived from pre-Roman times, it's a later re-import from the British isles.
The Celtic culture in Brittany is not something that survived from pre-Roman times, it's a later re-import from the British isles.
Stop making up silly, false, fake identities.