He he, to be honest, I've already changed a lot about myself over the years. I'm fitter, stronger (beat a weight limit at the gym last week that had me stumped for over a month
), my teeth are fully restored, I'm getting more confident with people interaction by the day, a good job (could be better but I'm grateful for what I've got), and more entertainment options than I know what to do with. 
Although, I do wish I didn't spend anywhere near as much time as I did isolated in my room playing videogames when I was younger, and instead getting out to see more of the world while I had the spare time (and zero need to earn money with employment
), but what's done is done. Higher motivational levels would also be desirable, but I am working on that. 
saunderscowie said:
Similarly I wish I could some kind of martial art when I younger. Wing chun or something. I am actually thinking about starting to take class in the summer, however I feel with both musical instruments and martial arts people need to start at a young age to be good or stand a chance at getting good? Maybe this is just a misconception i'm not sure...
And lastly I wish I was good at drawing! Maybe not so much taking lessons I think people are just born with a natural skill to draw well.
Vast misconception. Whilst it may be true that young developing minds take to learning musical instruments quicker than older ones, it's far from impossible and just requires more focus. My friend became interested in learning the guitar at age 19, he's 22 now and I've seen very few better at it. He's inspired me to take it up too, though admittedly I'm a slower learner. 
If you want to get into drawing, try the Art Academy DS Retail/DSiWare games. I'm trying out the first DSiWare game right now and its doing wonders with teaching the very basics. 
Lrrr said:
I also would have liked to pursue the piano more. I can sort of play a few simple things - some are even recognisable! - but I would like to know more. I feel an instrument is something you do better if done from a young age rather than trying to get taught it later on in life
Not to sound like I'm Nintendo's PR-man or anything, but there is a cheap DSiWare Piano-teaching game you could maybe try? It's nowhere near the level of Art Academy's teaching efficiency, but it does provide a full keyboard layout and highlights to help you hit the right ones in time with the tune. At the very least, you could try it to see if you'd like to take it further or not.