AITA for going to America instead Japan?

This happened last year but my best friend has not talked to me in a year and a few of our mutual friends are saying I'm an asshole. I feel I am not in the wrong so I'm asking reddit.

So I(18f) have been planning this trip to Japan with my best friend (18f) since our first year of high school. We are both very determined people who have the mindset "set a plan and stick to the plan" so as soon as we talked to our parents about it, who said if we saved up for it by our senior year, they'd let us go, we've saved every possible penny we could. We each had our own bank accounts registered with our individual goals. And in 2023 we realised we'd saved about 80% of the money needed with still one more year to go.

The drama started when I qualified for a study program in America. It was a program I'd always wanted to do but I never thought I'd get to because the interviewer's were infamous for being brutal and the acceptance rate was very low. However, I still took a stab at it and ended up qualifying.

The issue was, my parents couldn't afford a two month long stay in America and though I'd told them about the program, I'd never told them I was applying (again the acceptance rate is very, very low) so they felt blindsided. They also thought that a 'vacation' in America followed by a vacation in Japan sounded frivolous. So my parents said I'd have to pay for America myself. I had to chose.

To be completely honest, as mush as I wanted to go to Japan with my friend, I immediately knew that I was doing the program. When I told her my decision, she called me selfish and self-important. She didn't talk to me at all after that and I went to America. When I came back, it was right at the start of exam season so I barely saw her. And she decided to go on the trip without me after we graduated last year. Now I've tried to ask my parents but they are my parents so they always say my future matters more but I don't know anymore.

Should I have honored a pact my friend and I made six year's ago? Was I an asshole for choosing to go for the program? Did I truly abandon her and our friendship?