Venting talking about the future/making plans

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i feel so gross when i start making plans for the distant future. these conversations come up a lot at work, and i feel sick just being in the discussions. i did have a plan for my future, so i usually just tell people what my original plan was, but then i get so sad. reminding myself of my old plans for the future makes me so depressed because i know that it's all useless and/or impossible. on top of that, i just hate lying. i want to tell people that i have no plans because i'm going to die soon, but i can't do that for obvious reasons.
it's so annoying to be constantly asked for updates on some future life goal. i'm not working towards anything, so i never have an answer. i just seem incompetent and lazy, which i am to an extent, but i just can't even pretend to have an answer.

there are so many things and events coming up next year. i tell people that i'll definitely attend whatever event is taking place a year from now, but i obviously won't. someone i know at work even joked about how he'd make me attend this festival a year from now because our favorite bands were confirmed to be performing there. i don't even think he was serious, but it still killed my mood. it's such a simple conversation, it goes by so quick, but it makes me feel horrible.