LOL,
I agree that people have different opinions about what morality is.
This is evidenced by the various opinions seen here. This is called descriptive moral relativism and is uncontroversial.
You took the fact that there are different opinions about what morality is and concluded that that is all morality is.
Do you not see the fallacy in that reasoning? You take the fact that there are indeed differences of opinion as to what is moral, and from that fact, made a meta-ethical claim i.e. that objective moral values and duties do not exist. But a thing's existence (ontology) is wholly independent of whether or not people agree about the nature of said thing.
To give you an example, there are differences of opinion when it comes to the nature of quantum mechanics. There are at least eleven different views about the nature of quantum mechanics. If we were to apply your reasoning here, we would have to admit that there is in fact, no objective truth at all about the nature of quantum mechanics!
In a classroom full of people a teacher could hand out one math equation to the students and get back twenty different answers. The fact that there is disagreement about the answer does not give us justification for saying there is no right answer!
So your reasoning is a text book example of a non-sequitur.