Sadly I don't have very much advice to give you, but I'm happy to share some thoughts anyway. You sound like you're in a very similar situation to myself. I have recently graduated with a degree in music, but I too am at a total loss as to what to do with myself, and have consequently buried myself in distractions in order to avoid the issue. Like you, I'm afraid of making further investment in studies that are only going to provide a negligible improvement to my employability.
I think we are of a similar disposition in that what we commit ourselves to as a vocation needs to be something meaningful and personally fulfilling, which is a really hard criteria to fill. Putting a positive spin on it, I think that this means we have the foresight and self-awareness not to charge headfirst and trap ourselves in the thorny brambles of a soul-draining and ultimately deleterious career, and it also suggests the presence of a social/world consciousness and idealistic mindset which is pretty admirable. Of course, society has a nasty habit of making us feel terrible for not conforming to the traditional route through life, and it's very understandable to start doubting one's role and worth in the world, comparing oneself to others who succeed according to the 'recognised metrics', and not having money/relying on welfare can be degrading in itself. I have no real advice to offer here, but I just want to stress that I do empathise. You and your thinking are not flawed.
It's unfortunate that your mother is giving you a hard time about this. I am guessing that it probably comes from a place of frustration at your situation, not at you as a person. If it is actually directed at you and she's calling you lazy or something like that, then that's regrettable and she's in the wrong imo.
Regarding socialisation, I would be interested to know what it is that YOU enjoy talking about? What are your passions and the things that you could hold a conversation about? It may just be that you have niche (but in no way less valid) interests which are hard to broach in small talk. If this is the case, you could consider linking the current subject through a related topic to something that you are more comfortable and enthusiastic talking about (as Sunny suggested in the previous post).
All the best and I hope this helps in some small way!