I have to agree on this point somewhat. I'm not saying you're "just some 23 year old boy who think too much" (Altho I'm leaning that way), but the difference in thinking, attitude and well-being between teens to early twenties to late twenties and into thirties and beyond can be drastically different in each.
Yes and we have to keep in mind that people grow up a lot slower these days in well developed nations. In other words, we're spoiled rotten kids at 25.
So not having found your role in life at 23 is not uncommon these days.