[cynicaldevil]

I'm probably not as old as you; I turned 20 a couple of days ago, and I most certainly do not want to become an entrepreneur, but here's something about how I keep myself motivated:

Each day; at least once, I try to read/think about something which makes me feel totally worthless. It could be anything, about how there are people out there building really awesome stuff, conducting research in various STEM fields, or producing fantastic works of art, just anything good, really. Elon Musk's Mars mission would be a great example.

Realising this fact makes feel really, really guilty inside, and I know that I am not contributing enough to this world. That's all the motivation I need to get on with my work.

This stuff may sound a little cheesy, but it works for me :)