I (F21) want to move out but mom (F53) makes me hesitate

I have been feeling kind of stuck where I live, and I’ve been feeling this way for a while now. I am honestly not happy with my current environment and I dislike living here. I had the opportunity to study in Barcelona about a year ago and I loved it, I do speak a little bit of Spanish (Intermediate) and it has gotten better since I was there for about 8 months. I am graduating this year and was thinking of doing my Master’s there and so officially move out of my mom’s house. Even if I decide I don’t want to live there long term, I don’t see myself coming back to my city.

I got accepted in my top university and my mom hugged me and told me she is happy for me, however she doesn’t understand why I want to move out of the country completely. I can see in her face that although she wants me to be happy, she’s not happy with the decision overall, she didn’t exactly tell me why she’s not happy but she wants me to either stay in the city or move to a close city but not that far, she straight up told me “what are you even going to do there”. I was so confident with my decision to move out but she honestly makes me doubt it, I can’t tell she is sad and it destroys me, I am her first child so I understand but I don’t know what to do now.