Switching major from neurobiology to aerospace engineering

I was admitted to UCSD for fall 2018 with a major of neurobiology but I want to switch to aerospace engineering. I’ve been a straight A student all of high school I have the work ethics to attain satisfactory grades. Is stressing out about not being able to change my major worth it? How easy would it be to switch? Is it impossible or are my chances high as long as I do well with my courses?

This is what their website says: http://maeweb.ucsd.edu/undergrad/ugadmissions

Freshmen have two chances to apply. They can first apply in summer after their first year at UCSD. To be eligible to apply, they need to have completed the following 6 courses:
-MATH 20A, 20B and 20C
-PHYS 2A and 2B (or 4A and 4B)
-CHEM 6A

Freshmen can apply again in summer after their second year at UCSD. There will be no more chances to apply after this second application period. To be eligible to apply, they need to have completed the following 11 courses:
-MATH 20A, 20B, 20C, 20D, 20E and MATH 18
-PHYS 2A, 2B, and 2C (or 4A, 4B, and 4C)
-CHEM 6A
-MAE 8 (or CENG/NANO 15 or SE 9)

It is very hard to try to switch into any of the engineering majors at UCSD. You would need to complete these classes, and be able to maintain a 3.7- 4.0 (Only A-'s and A’s in all the above classes) to have chance at getting admitted. This is because the department admits students by GPA, and you may have the minimum GPA to apply, but they only select the people with the top GPA’s.