I got into my dream career and now my best friend wants to apply too

In July, I (17F) applied to a modelling agency, and in mid-August they got back to me saying they wanted to sign me. I signed the contract, but I kept it mostly private for a while. Eventually, I had to tag the agency in my Instagram bio, so I decided to tell my best friend (16F) of 5 years about it after.

I FaceTimed her and told her I had some big news. I told her I’d been signed to a modelling agency, and she was really surprised and congratulated me. She said she’d already noticed the agency in my bio and knew a little bit about it.

She started asking me a lot of questions about how I applied, what poses I did, what the process was like, etc. She also asked to see the photos I submitted with my application, but I wasn’t comfortable sharing those, so I said no. She asked a few more questions about the process, although I don’t remember everything.

Then she told me that she’d actually applied to a different modelling agency last year. They reached out to her asking for photos, but she didn’t reply and ended up ghosting them. I gave her a little warning about being careful with contracts and things like that, just in case she was thinking about responding to them. Then she asked me

“Would you be mad if I applied to the same agency?”

I was honestly caught off guard. My first thought was “Why now?”

I told her I didn’t mind, but after thinking about it more, I’m realizing that I do feel kind of weird about it.

I know this sounds selfish, and I don’t want to gatekeep modelling from my best friend. I genuinely want good things for her. But I’ve wanted to model for basically my entire life, and getting signed was a HUGE moment for me. I never really thought it would actually happen. I kind of wanted this to be something that was just mine for a little while.

What makes it stranger to me is that she’s never really expressed serious interest in modelling to me before this. She never told me she wanted to pursue it, and I had no idea she’d even applied to an small agency a year ago until this conversation. I guess the timing is just throwing me off?

So I’m confused about why it bothers me so much. She hasn’t actually done anything wrong, and she was supportive and congratulated me. But something about her immediately wanting to apply to my agency made me feel like my moment suddenly became our thing before I even got to enjoy it. I also feel guilty because on FaceTime I quickly told her I didn’t mind, when honestly I’m not sure that’s true.

Am I being selfish for feeling this way? Is it actually weird that she suddenly wants to pursue modelling after I got signed, or am I reading too much into it?

TL;DR: I (17F) got signed to a modelling agency after wanting to model for years. I told my best friend (16F), who congratulated me and then immediately asked if I’d be mad if she applied to the same agency. She had previously applied to a different agency but never told me or expressed much interest in modelling. I told her I didn’t mind, but now I’m realizing that it bothers me. Am I being unreasonable?