Making certain assumptions about what the terms “value” and “meaning” mean, I suppose that means I’m probably a nihilist. (By your understanding of the term, anyway.)
The “certain assumptions” I’m making are that “value” and “meaning” are, er, value judgements, which require that there be a sentient entity doing the valuation. Or put another way, value and meaning are inherently qualities that must be some intelligent entity’s opinion - there aren’t “value particles” that can be embedded in an object’s substructure or “meaning waves” that are generated when an act is carried out.
As an atheist, I don’t believe that there’s any outside sentient force that has the authority to assign “objective” or “inherent” value/meaning to things. (As an armchair linguist, I note that even if there were a god making such judgements, they’re still not objective or inherent - they’re just subjective to an entity that’s in a position to enforce its will on others.)
Or put another way, I think the very notions of “value” and “meaning” are inherently incapable of being objective or inherent, by definition. Value is always in the eye of some beholder, even if the beholder is a god.
This doesn’t mean it’s impossible for individuals to hold value or find meaning in things, of course. But it does mean that value and meaning only exist as long as there’s a person to espouse the opinions. Once Earth drops into the sun and everybody’s dead, value and meaning vanish too. (Until the aliens arrive and decide that the space debris left over from humanity’s reign are the most awesome and important collectibles ever, anyway.)
And holding the above opinions makes me a nihilist…? Yes? No? I don’t know.
In any case, if all value is subjective, then morality based on value must also be subjective - though it can, as noted, be imparted to or forced upon others via trying to teach them to share your opinions or by promising/threatening rewards or punishments depending on how well their behavior conforms to your own morality. So if there really was some god out there sending everyone who annoys him to hell, then that wouldn’t really be objective morality, but it would be morality that everyone has to deal with and (if they knew about it) account for nonetheless.