A lot of necessary jobs go undone if nobody wants to do them, like garbage disposal, sewer maintenance, etc. The notion that if everyone did only what everyone wanted, at least without moving to the far, far future, that everything necessary for society to function would get done is baseless.

Furthermore, the idea that Marxism isn't Socialist is old, yes. However, Marxism is based on collectivization of property and worker's rights, so it is Socialist. Further, it's by far the most historically relevant and the most relevant at a modern point because there are several Marxist states.

I'm not sure what you're trying to do here, you're taking a hard-line stance abandoned by most Anarchists a century ago, all you're doing is making Anarchism look silly when there has been advancements in Anarchist theory. Trying to discredit Marxism as validly Socialist and pretending Socialism means Anarchism only further alienates what you're saying from actually convincing anyone.