My chances at UT Austin? PLEASE help

my GPA and it is a 3.979 GPA weighted on a 4.0 scale. My SAT scores are a 670 in CR, 670 in math, and 720 in writing. I am not in the top 10%, but definitely in the top 15%. It sucks that I don’t have a rank but I attend an incredibly competitive high school.

My first choice major is Neuroscience and my second choice major is Psychology (BA). What are my chances of getting in to these majors? UT is my top choice and I REALLY want to go. I’m afraid I won’t get in.
Also, how difficult is it to change majors once into the school? I might change from the BA if I get in to a BS in the future, so will this be tough to do?

It seems like you are OOS, right?
Then, very difficult.
I

Nope I live in Texas. I am a resident.