Yes I do regret a lot of what I did when I was young.... BUT.... Asperger's was ultimately the blame for it (or, should I say not knowing I have it).
At the time I didn't know I had Aspergers and so I couldn't recognise behaviour and adapt my life to cater for it. For example, I remember overhearing a group of lads talking about their clubbing antics. To me this was "cool" and a way to fit in with people. So I'd become obsessed and went out clubbing a lot (on my own, no friends to go with). Then because of all the Aspergers symptoms, I would typically drink quicker and drink more. I'd end up so wasted that I acted like a drunken idiot and would do such stupid things. I'd be thrown out of clubs, and even on several occasions, this one bouncer would go for me in a rage because I'd have wound him up. Again, behaviour I was just mimicking. I'd seen some lads winding up another bouncer and all of them, including the bouncer were laughing and joking around (I did it expecting the same joke and laughs reaction from the other bouncer). In hindsight I can see the reason for the jokes and laughs was because those lads knew the bouncer personally and were friends, so of course a bouncer who didn't know me would react differently.
Once, I ended back up at some random peoples house. Not very nice people at that. When they smoked, they dropped cigarette ash on the carpet. Again, I somehow latched onto them doing that as it being "cool". So when back at mine smoking, I'd flick ash onto the carpet as well.
The crazy thing is until knowing I have Asperger's many years later, I didn't recognise any of this "latching on" and "mimicking" behaviour. It was done subconsciously.
Certainly I regret my actions, but I'm more annoyed and regretful that medical services were no help in correctly diagnosing me, when looking back on it, it would have been completely obvious. This would have helped prevent any of that happening because I'd have taken a different approach.