If your in a Western nation, marketing will be telling you that you can't be happy unless you have this and that. That you'll be inferior.
They're lying, manipulative f*(&ks who deliberately set out to create a contrast your life can never match up to so you might be convinced to buy their product.
Turn off the tv, or at least mute the ads. It will remove one source of stress from your life.
Stop watching news. The only reason to watch is to find out what's going on in the world around you, so that you can do something to help what's going wrong. You can't help others until you've helped yourself.
And I hate to say it, but it seems the News is trying to fill the public with Fear.
Find things you enjoy doing, or things you remember enjoying doing. Try them again and make sure that while you're doing them, your living in that moment, not worrying about the concerns of tomorrow or the past.
I don't know what you think meditation is, but in it's purest form it is time set aside to take stock of yourself, your body, your mind. To find what's important & let the lesser things slide off to one side for a while- not oblivion but a relaxed state of mental alertness.
If nothing else, it's something you can try with less finality than suicide- ie you can hit the Back button. I'm learning from & recommend a book called "Teach Yourself to Meditate" by Eric Harrison.
There is a whole lot of stuff in the world that is s*&t. That when you find out about you wish with all your heart you could change, but know you can't.
At those times, remember that you are only responsible for your actions- what you do with your life. What others choose to do, you can't change. You can try to persuade them, but you can't make anyone else listen.
And if you think that there is one special person out there who you could be happy with- your wrong. Although most people are very hard to get to know because they are afraid & defensive, inside everyone is something beautiful- just understand that sometimes that something beautiful thinks it needs thorns to protect itself- and that if you don't try to understand that for them, noone will.
Sorry for preaching, but these are all things that helped me come back from a very bad place.
I guess the biggest thing is to remember that noone can know everything. You can never understand anyone else's motivations fully unless you are them. heck, people are rarely self-aware enough to understand their own motivations. The world is not malicious, it's random. It's confused. But you don't have to be, as long as you understand yourself.
And whatever your religion, a pretty wise guy said what every other faith tries to say, but religion often loses along the way- "Love one another." And the first step to that is understanding one another.
Hang in there. Tomorrow's another day where anything could happen. And something WILL happen if you go looking for it rather than waiting for it to come to you.