You are wanting to get away from it, have time to think, for 13 days. Keep focused on the purpose of this trip 'find yourself', which right now is more important than seeing the great national parks.

Zion and the Grand Canyon will still be there when you have more time someday, and can make the trip in a less stressed state of mind. You are very young, and if you make this roadtrip a memorable one for all the right reasons, you will find there will be many more in the future.

I urge you to choose something closer to home. If you tend towards mountains, I'd head to Colorado, if the coast appeals more to you, then follow Buck's advice. But to spend most of your time driving does not give you time to think/meditate. Head for a place where you can spend considerable time out of the car.

Battling traffic you will need all your concentration on the road at all times. It will not achieve what you are setting out to accomplish.

Neither will sleeping in your truck put you in a reflective mood. I would highly discourage it, even at safe places such as truck stops. For your sanity at this time you need to wake up refreshed, have a shower, get dressed and check it all out in a full length mirror. It is impossible in a car to keep up your daily regime. All that will not make you feel any better about yourself than you do right now.

Stay closer to home and budget for cheap accommodation. With the hotel discount coupons you should be able to pick up cheap hotels/motels along the way, and give yourself the opportunity to sleep in, lazily get dressed, enjoy a leisurely breakfast, even if it is only cereal, yoghurt and fruit in your room, though most places have at least a breakfast of sorts..

Don't worry about not seeing Zion and the Grand Canyon right now. Not everything needs to be achieved before you turn 25. In my case, I had earned my seniors card, and was a grandmother, before I ever hit the road. Now a decade and a half on I have seen more of North America than most of its citizens ever will.

All my best wishes.

Lifey