Ask YC: What would you tell your younger self?

If you could tell your younger self one thing what would it be?

I was curious what the YC crowd would say to this.

Personally, I'd tell myself to live for the moment. Don't worry about the future too much, as long as you have a good head on your shoulders things will work out. Before you know it years have flown by and you'll wonder where they went.

So, what would you tell yourself?