Are the 20s your hardest years?

I was so used to hearing "oh the 20s, I wish I could relive them again, they were the best years of my life". You hear it from your parents, the movies, and you just assume its true because its when you had the most freedom, and the most energy. You assume that after you hit 30 you'd be married, with children, and pretty set in your career so no real room for energy, craziness, and the like. So the 20s must be the best! No studying, no commitments, and a job is just something that pays you enough to maintain a decent social life. It sounds like heaven. But lately, and it started with an interview with Gwenyth Paltrow that I watched 2 years ago, it seems people are scared of the 20s and would never go back to those years. "Go back to when I had no clue who I was! To where I was so confused about who I wanted to be, who I should be, who the people around me wanted me to be! No way would I go back there!" And its actually very true. In our 20s all we do is think think think. Where do I go from here? What job would suit me? But if I take this job opportunity now, what does it mean for my future career choices? Should I do my masters now? But in what? Is that really what interests me? Should I love this person? Enough to marry him/her? What is marriage to me? Can I make such long term committments now? But I'm too young! No I'm not, I'm freaking 20 something! And it just goes on and on. I saw Gwneyth Paltrow talk about hitting 30 and being so happy within her skin that she really would never go back to her 20s. When she was asked "dont u wanna stay in your 20s?" here answer was such a shocking NO that I was taken by surprise. This was the first person I had seen saying such an insistent NO to going back to when she was young. Later more followed though, with the same big NO. I am turning 25 very soon, and I can surely say that yes, I probably wouldnt want to relive the confusion of these past 2 years again if I was sure that when I hit 30 I would have resolved all the pending questions in my mind. If by 30 I knew who I was and what I wanted out of life, I would never want to live the confusion of today again. But I just hope I still have some energy left to still be able to enjoy life past my 20s, and I would like to believe more and more that life does not end at 30!