If I could go back to age 18, knowing that I was interested in computers, I would start a startup and/or try to get a job at a startup. If I had to work my own startup and work another job to feed myself, I would do that.

I eventually ended up failing out of college because I didn't want to be there, but spend years of my life getting drunk and wasting my time. Could have started real life a lot sooner and been far ahead of anyone that went to school.

Traveling and doing a startup is now a great option too, since you can work from anywhere with your laptop.