I was depressed in high school and talking to my mom about happiness and one of the things she said to me, was that often real happiness comes from learning to be happy with being content.
At the time I honestly found the thought kind of depressing, but it stuck with me and I've only seen it to be truer and truer as I've gotten older.
I hope you know that what your mom said to you is not the whole truth. "suicide is something weak cowards think about" is true, but you don't have to be a weak coward to think about suicide. "not every one can be happy" doesn't mean you and your loved ones are destined to not be happy.
Isn't it more just appreciating the small joys in life? If thats complicated enough that it has to be a whole philosiphy then I think we're fucked as a species.
You don't sell books to teenage boys and 20-somethings by telling them they need to be more appreciative of small blessings, not when they're so horny that they can't think straight. You gotta sell them the idea that they can embrace all the same toxic traits that are making them miserable, but with a branding that sounds legitimate.
Most young dudes who subscribe to "stoicism" think it means getting a square jaw from the square jaw store and then not showing happiness about anything. Like they already do, but now with self-help terminology backing it.
I'd love to see a new movement where guys learn to express overwhelming joy at small things in life and can be genuine with each other about literally anything rather than making every moment together the Sarcasm Olympics.