>Can a slacker goodfornothing McDonald's-working college dropout that only live day to day, party to party, feel self-worth or should they feel worthless?

The person you posited has more self-worth, by definition, than the self-doubting programmers in this thread. Precisely because they are getting by while doing something much less "meaningful" or "useful" (as evaluated by others) than a job in software engineering.

(Of course, I'm talking about the hypothetical person I imagined when I read your post; most such people that I've met in real life actually feel pretty bad about themselves, party to numb the pain, or because they have nothing better to do, and actually feel worse after they've had their "fun", et cetera. But let's roll with your scenario for a second, I think you're on to something important.)

Maybe this person doesn't have to suck up to a pointy-haired boss, or doesn't have to mentally model arcane concepts that are subject to planned obsolescence anyway, or doesn't participate in the violation of people's minds facilitated by the infotech industry.

Or maybe they still do the aforementioned things but on their own terms. Maybe they code for fun and write malware when hungover out of pure malice. Or they don't. Maybe they're a hooker on smack and just shat on your floor. It does not matter. What does matter is that this hypothetical person does not have the experiences that make you ascribe "negative" or "insufficient" self-worth to yourself.

In other words:

* You can be an absolutely awful horrible piece of shit person by anyone else's (or everyone else's) standards and still have a feeling of self-worth. This is by definition: self-worth is the worth that you ascribe to yourself. No matter how much you care (or not - it's a choice) about other people, self-worth is self-worth; worth to "civilized society", "a value system" or "an individual other" is not self-worth, by definition.

* On the other hand, the "need" to experience something that others call "self-worth" does not in fact originate from the self, but is a vague obligation imposed onto you by others: the obligation to have some sort of nebulous experience that others call "a feeling of self-worth".

* There is no such thing as "should feel worthless": nobody gets to tell anyone else how to feel. Imposing an obligation on someone to experience an emotional state is, technically, a violation of bodily integrity. Yeah I said it. Whatever real, physical neurochemical process lies behind the experience related to the concept of "self-worth", is a normal part of the body's homeostasis, serving to ensure the self-preservation of an animal that is able to kill itself for entirely abstract reasons (such as awareness of own mortality, and downhill from there).

In even fewer words: in my book, someone who is an "ok friend" and throws "average parties", is defined as "a waste of my time". But they still get to live on the same planet and breathe the same air as me with my silly book. I don't get to decide their self-worth for them, and nobody, and nothing, gets to decide that for you, either.

Therefore: you can feel perfectly good about your successes and failures without even entertaining the notion of there being a concept of "self-worth". According to nobody in particular, this is actually preferable, for Occam's razor reasons if nothing else.

In theory, you can be a very "successful" person and still feel worthless; in practice, the feeling of worthlessness usually prevents one from becoming "successful", and makes it look as if it's the other way around.

Ultimately, the matter can be put like this: do you see yourself as goods to be bought and sold? If yes, then go ahead and demonstrate your high "feeling of self-worth" as much as you have to. If no, then why even bother with pricing yourself?