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I am 29 and the knowledge of life, the emotional stability, and the perspective I have are miles beyond what I had in my early 20's. However, those experiences of the past 10 years are what turned me into the man I am today.
There are many rational reasons to go back in time with the maturity you have of today. I racked up credit card debt going out all the time, didn't study hard, had a useless major (business economics), almost never went to class, etc etc. Some of that I would change and I could theoretically end up very well off by this same time (much more than I am now).
However, in reality, you may have a very strong sense of dissatisfaction because you will know what to compare to in the future. Even one truly great experience that you may not be able to recreate will forever leave a longing to your alternate past future self.
For example, one of the best nights of my life (age 20) was a roller coaster of emotions situation. There was a girl there that I had drunkenly hollered at on Facebook that had responded sorry, I don't really know you well, I don't want to go out on a date. It was super embarrassing when I realized what I had done the next day checking through phone/web history of the night before. A week later I go to a party and she was there. It was such a big learning moment in my life - I could of either acted like a coward or acted like someone with a backbone. She saw me come in, I smiled, went right over and gave her a big hug. I immediately felt a surge of electricity about the moment and it ended with me bringing her back to my place a few hours later. It was my first successful A to Z one night situation.
If I went back and could do it over again I know I would never again be put in that exact situation. And I would also have the confidence (that I have now) and wouldn't need to be in that situation. However, the experience of that moment, the process, rather than the end result, confidence with girls, is what truly makes it unique and special. It is pretty hard to quantify that feeling in terms of doing things "better".