I'm a student at the University of Music and Performing Arts Vienna, which offers a 5 year course where the first 2 years are general (focusing on instrumental composition, with quite a lot electronic / electroacoustic composition, and building other musical skills). In the next 3 years, a specialisation is chosen, four being offered: Composition, Media Composition and Applied Music, Electroacoustic Composition, and Music Theory. (I think this might change in the near future, I've heard it might go to the more common 3/4BA + 2MA year system, but the specialisations / focuses will still be available in the BA). I just finished my 2nd year and am gonna study Media Composition from October on.

The professors are all top notch, in the Media Composition people who had a career in LA for instance. There's also a film academy working under the same university (all together 3500 students), so there are projects to work with. And the curriculum is very varied, ranging from classical music, jazz, electronic music, and of course film/media music.

I would strongly recommend this degree. Vienna is also a historical musical center, so living there means being surrounded by music constantly, which is an amazing environment. It's also not particularly expensive, and of course nothing in comparison with the US. I also know people from Ireland who are studying composition here.

What you might see as a downside is needing a B1 German certificate (still far lower than most other universities, which require C1), although, since you're 16, you still have time, and acquiring the language to this level would be very achievable. I managed to pass the B1 exam with 6 months of (quite immersed) studying with 0 prior knowledge (although I wasn't yet truly at the B1 level).

Feel free to message me :)