"However, if I had followed all of my parents’ advice I would lead a boring life. Interesting doesn’t ensure survival - caution does. Unfortunately, caution also prevents an interesting life from unfolding."
And if they'd followed your advice (ignoring the whole time travel issue for the moment) then it's unlikely that you'd be able to live the life you live now. What they did for you was selfless, not boring, and what you're advocating a more selfish way of life. I think the several posts suggesting you use some of your spare time to help others underlines that fact.
I'm not saying I'm perfect. I have a wife and three young children and I've just decided to get a motorcycle. That does nothing for my family (except perhaps worry them) and whilst it's exciting for me I'm under no illusion that it's anything other than an entirely selfish act. It'll be fun, but for me true happiness lies with my friends and family, not risk and adrenaline.