Sounds to me like you grew up. Be happy about it. Acting adult and taking responsibility - especially for your kids and your life - is not prudish or being 'too good'. If you criticized other people for their choices, called them 'BAD', then, THAT might be prudish and possibly self-righteous. They will have to face the consequences for their actions soon enough. Hopefully, they'll wake up to what they're missing, rather than ineffectively mourning their (what?...) lost youth (?!) and supposed freedom, before that.
If you drink and drive, you risk an accident. Accidents can happen anyway, but are MUCH less likely when you're alert. If you're dead or severely disabled, you can't do much for your kids and family then. You don't get a 'do-over' if you're dead. That's the reality people hide from.
You seem to have come to grips with reality and consequences, and are behaving accordingly. It doesn't mean that you're a stick-in-the-mud. You can have lots more fun AND be able to enjoy it, when you're awake and alert. (Seriously, what's fun about staggering around, passing out, being hung-over, or vomiting in a toilet? What's fun about trashing your brain?)
Your kids are receiving great benefit by your attention and care. Early childhood years are very precious. Many of the attitudes and approaches to life that we keep are formed by or before age 8. You are serving as an example they will remember. When they're grown, you'll get the delicious pleasure of continuing to have fun together with a rich closeness and respect that you are laying the foundation for right now.
Have compassion for the others, and (quietly) pat yourself on the back.
Try not to burn out - which will reduce your ability to enjoy everyone - with all your activities. Mom needs to take care of mom, or everyone won't do as well. Congrats on making good choices!