I like my life. I have a nice girlfriend (if I dont mind saying myself!) and I'm about to have my first baby. My job is stable and we both earn decent money - although I know life isnt about all the material things.
If anything I'd probably put actual effort into School/College/Uni rather than just get through and take some opportunities I didnt when I was younger (dont need to discuss those here

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I would never really want to change much as I am a result of my past. Even putting minimal effort in a Uni meant I had more time for playing, drinking and other things

Maybe I'd stop myself slipping a couple of years ago, the back pain as a result is terrible.