I'm 28 years old. I couldn't do what I wanted to do in my life because I crossed the age limit. Right now, I'm earning 15k and my friends earn 80k to 1 lac. I feel like I want to end my life. What else can I do?
Learn about the hedonic treadmill, also known as hedonic adaptation.
Also read about stoicism.
Good book about these subjects is "The Antidote" by Oliver Burkeman.