If it makes you feel any better, I'm in my late 20s. I'm college educated, and most of my friends are college educated as well. 99% of us aren't married, 50% of us have never worked in a "professional, white collar" position, 99% of us don't own a home, and like 75% us are still rooming with the same people we knew 10 years ago before we went off to college. This goes for men and women. It's like FightClub if the narrator was an overqualified warehouse worker, bartender, or waiter.
And this is a large part of the reason that I'm on here. I'm nearing 30, and all I'm doing is living for myself. I have no purpose in life aside from working for some rich guy so that he can relax by his pool on the weekends and take vacations with family in his private jet.
I'm in your same age group, late twenties.
I'm college educated too and worked in an IT job for a couple of years after I finished college before I quit that job last year.
I feel like I've been in the "real world" long enough to see how anti climatic and disappointing adult life is. I have no purpose in life, but I also am so unattractive/undesirable that I can't enjoy dating/sex/romance in my free time because I've been dismissed/rejected in that arena.
So I ask myself what is the point of living now, what do I have to look forward to anymore? As far as I can see past the horizon, all I see in my life is years/decades of working in a job I don't really enjoy, facing my youth disappear as I deal with the consequences of old age, being lonely the entire time, and the best moments I have will be just doing the few hobbies I have left that I increasingly find myself being unable to gain pleasure/satisfaction from.
People always tell me the same thing when I explain this picture of my life to them "You just need to find some hobbies." I've had hobbies for years and years. However you can't help but see how boring/mundane this kind of life is. So I go to the same place for work year after year, sleep, eat, exercise, and do my hobbies on my free time.
I don't see that as a life worth living. What's the point? Besides the existential issues, I don't even get a hedonistic sense of enjoyment from life either. If I had a flourishing social and romantic life I'd at least be able to enjoy that but I'll never get to experience that. The most I'll ever get in the dating arena is a girlfriend who settled for me, doesn't really love me, doesn't really find me desirable, but settled for me because I'm a stable, reliable, and trustworthy person. Yeah no thanks, I'm never settling for a pathetic relationship like that yet I know that's all I'll ever get in this world.
My suicidal ideation in my opinion is a rational evaluation of my circumstances and when I die I plan on writing this in detail in my suicide note. Why my decision to end my life wasn't some impulsive decision but was well thought out.