I'm 23.
Every choice I've made has led me to where I am now.
So in a sense I'm not particularly bitter about the regrets.
For example; I wish I'd started my degree when I was 18 instead of working for 4 years and then embarking on it. However, if I hadn't bummed around after my A-Levels and then got a kick up the ass from my parents to get a job and pay rent, I wouldn't have taken the easiest job in the 'Situations Vacant' section of my local paper (Airline Baggage Handler). I wouldn't have then worked my way up through the ranks to a supervisory role. I wouldn't have reached the 'glass ceiling' and got incredibly bored. So, I wouldn't be doing an Aircraft Engineering degree and I wouldn't be getting paid to fix planes in my holidays.
There's another example that's to do with a chick (everyone has these kind of regrets). I can't be assed to go into details but I screwed that one up and I wish I hadn't. But, there are a lot of things I probably would have sacrificed for her and these sort of things are who I am. I doubt I would do as much riding, certainly not as many weekends riding in London and heading off on a roadtrip and shit like that. I also wouldn't have travelled around Australia for a few months and I wouldn't have had as many sexy times at uni!
So yeah, I'm happy with my life currently, so I have nothing to moan about and nothing to regret.