I am almost a completely different person than I was 10 years ago. And I much prefer myself now.
10 years ago, I had ZERO self confidence in social situations, would fall in love with any girl who even said hi to me, was completely over-zealous about my work to the point of pissing off those who worked with or for me, and was just generally a pretty sad individual. It didn't help that the company I was working for, which was a touring family-entertainment company, was mostly staffed by highly egotistical, but not very highly skilled, 18-21 year olds. Most of them had two objectives - get drunk and score with chicks. I was there to put on a good show and do things right...so we clashed a lot. It didn't help that I had been incredibly socially awkward since early high school. So I had very few friends.
Then I left the company I was working for at the time, and joined a new company. It was like night and day. Same type of work, but I went from working with people who clashed with me all the time over my desire to put on a good show, and their desire to just get a paycheck that would buy them more beer; to working with all people who generally wanted to do a good job and work together. But on the flip side, they could still have a good time when not at work. A VERY good time. I learned more about myself, and changed more, in that year and a half, than I had in my whole life.
I am now much more confident, but not near the level of being cocky or arrogant. I still couldn't just walk up to a girl and just start chatting her up, but at least I could hold a conversation if the moment presented itself (of course, I'm married now, so...). I am still dedicated to perfection at my work, but I know when to let things slide and move on...and I get along with pretty much everyone I work with nowadays.
I never have, and still don't, give a crap about exercise and being fit and trim and body building. That will probably never change.
My music tastes have stayed similar since about 1998 but evolved to the point that I know now exactly what I like.
So yeah, I'm quite a different person now. And much happier than I was then.