It's from experience. Older people know this world well. Doesn't matter what you vote for, power stays with corporations.
Young people tend to believe you can change things by voting, which is naive and a bit cute.
I used to feel apathy until I realized there is one thing I can control - me. I can choose to do fun things, replace bad friends with new ones, learn new skills, grow as a person. I can put my phone down and read books and stop watching social media and porn. I can change who I am right now. And I will feel good from doing so.
The society will stay the same, but my perception of my life will be enjoyable, which is all I can actually do. You don't have power over anything except yourself. Once you get that through your head, you understand how to not feel apathy anymore.
Always explode oil rigs on a Friday.