Keep in mind that mankind has had challenges throughout history. It is still a very good time to be alive, historically speaking.
Nonetheless, the possibility of civilisation's decline or collapse is a potentially depressing topic now being covered by mainstream media and blogs, as well as aggregator sites like this.
Access to information is a double edged sword. Do not overindulge in bad news. Many things mentioned here may never significantly affect you.
A resource if you feel depressed ... https://www.beyondblue.org.au/
A Reddit forum dedicated to those affected by collapse ... https://www.reddit.com/r/CollapseSupport
Support hotlines ... https://www.reddit.com/r/SuicideWatch/wiki/hotlines