For your consideration....
Welcome, Frog1387!
I agree with everybody's advise. Having done a few speed runs myself, I know that they can be a lot of fun if you need to drive like heck to get to a particular destination and have limited time. However, after just a few days of marathon driving, the road loses it's allure and it's time for a break.
Let me make a suggestion....
Some of the best roadtrips I've ever taken in my life are those with no destinations, no itinerary to keep to, no reservations that require adhering to. For your first roadtrip, I would suggest that you just get in the car and go. Meander. Explore. Take any road that looks interesting. Stop at anything that tweaks your fancy. Stay as long as you want at serendipitious discoveries. Quickly escape from anyplace that disappoints.
Now, there have been times where we have done speed runs of a day or two to get to an area where we explore like this, and then have had to do speed runs to get home. But these days of driving like heck are offset by wonder, discovery, and lack of schedules that are sublime.
So I would suggest that you target an area and enjoy the drive there by stopping and exploring along the way, then exploring whatever area you choose, and then, if there has to be a speed run to get home, limit those marathon drives to doing just that.
This type of trip can be freeing. I mean, how often do we get to live without schedules??? Not often in today's world and, as you enter adulthood, those opportunities will become even less frequent. You are young and have a lot of years for more roadtrips. You can get to other places you've missed on this trip in other years.
Well, that's my two cents, anyway.