I've known other kids who did finish a 4 yr degree in their teens or earlier, and all of those were options. Take another bachelor's, grad school, med/law school, work, travel, spend a year or two focused on art or music, volunteer in a service field of interest. Do more than one of the above, serially or concurrently. Change your mind. Change your mind again.

They will find their way. When you have a couple of years to experiment with before you are really ready to take on full adult responsibilities, you have the freedom to invest a little time in additional interests, and the things people wish they could have done.

There are many career options for mathy kids besides academia. Off the top of my head: engineering, biotech, economics, intelligence/national security, any area that involves analyzing big data.

...pronounced like the long vowel and first letter of the alphabet...