The best thinkers estimate a chance of 10%, or 25%, or maybe 50% that
some event will wipe out humanity during this century, killing you among
others if you're still alive at the time. That is much more likely than
many risks that people take care to avoid, such as car accidents.
As for terrorism, the chance you will be killed by that minuscule.
For the most part, the threats of human extinction don't inspire us to
action because they are imponderable: we don't know what we could do
to protect ourselves from them.
However, there are two noteworthy exceptions. We know how to campaign
to abolish nuclear weapons, and we can campaign for strong action to
curb global heating. That would reduce two significant possibilities
for killing all, or a large fraction, of humanity.