My advice, as someone who was intimidated by the work load at 18 and didn't pursue a major I should have, is to don't be afraid of it. Save yourself the time, money, and regret by putting in the work required now.
At the moment I am planning to pursue a bachelors with the end goal of obtaining a masters and potentially a PhD in either the areas of Geophysics, Planetary science, or maybe even Astrobiology. The University I would be attending for the BS degree does offer a BS in Geology and Geophysics, but...