Friend said to come to Carnival and is no longer going

Would it be safe for a bimbofied American girl to come to Rio alone? My friend moved to Brasilia without letting me know before my trip that I’d been planning for months because she asked me to visit. She moved for work and I guess didn’t think I was serious about coming to carnival despite our many discussions and confirmation that I’d do anything to go. I planned to stay with her and Rio and I scheduled time away from working and have been planning and telling everyone for months I was coming to Rio Carnival and doing hours of research and preparation.

Not to be rude but I don’t really feel any kind of desire to go to Brasilia other than visiting my friend. My understanding is it’s a boring capital city and she will be working the entire time and that doesn’t seem particularly exciting for me. She claims we could have a good time but I’m taking off work on a busy holiday specifically to attend that holiday.

I definitely had a different image for what would be happening on the trip she suggested I take to visit. And I don’t feel safe being alone in Brazil based on many of the things I’ve read on here. So I’m kind of at a loss on what I should do and significantly annoyed with my friend for disregarding my schedule or planning. I told her I’d do anything in my power to go even after my passport went missing before a different trip.

Am I an asshole for not wanting to go to Brasilia during carnival and being overly cautious about going to Rio alone and spending for a hotel etc to hang out most likely alone? Would I still be able to enjoy myself or should I sit this out and wait for another year and plan something with a group?

I’m pretty annoyed bc I put off getting an apartment for this trip so now I’m wondering if I should just go anyway since I already took time out.

Edit: Maybe i should have phrased differently but I’m kind of looking for a beach party atmosphere coming from New York a tropical vacation with parties and meeting people is what I was planning for.