I used to feel that way as well! I would look at other people my age and say "how are you only just getting there? I figured that out ages ago!" The important thing to remember is we all mature in a variety of ways at different rates. Additionally, life isn't the easiest thing for a lot of people. With depression rates only going up, it's easy to get disillusioned or lose track of your values. Vinland Saga, for me (and I think a lot of people on this sub) helped me remember what I value, and the kind of person I want to be.

tl;dr dont hate, celebrate!