I used to try (I can't always talk) and reply honestly and that made people treat me weirdly and try to take advantage.
I then tried making appropriate things up and that kinda worked but some people got angry and ended up calling me a liar and assumed a whole bunch of awful stuff on top of that, so ultimately it ended badly.
Now I just avoid people and conversation as much as I can and give vague, noncommittal and brief answers if anyone tries talking to me.
This works in the short term but anything longer than a few minutes has people assuming negative things about me, which if I have to interact with them again over time, means they can get emotional (angry) over the things they've assumed about me.
Life is so much nicer without involving other people.