You're in the EU, which is not trapped. You're having "grass is greener" syndrome. Americans envy Europeans for their 5 weeks of vacation and high-quality healthcare. (All taken, the EU package is better.) I don't think Europeans have US envy in general, but NYC and the Valley (which are world capitals that happen to be in the US) still have a draw. Even still... I think you're exaggerating the appeal.
Sturgeon's Law: 90 Percent of Everything Is Crap. It's true in Italy, I'd imagine. It's also true in the Valley. For everyone founding an exciting startup, there are hundreds of cubicle drones at places like Oracle. Coming to the US and working in the Valley won't automatically make life amazing.
Anyway, the Valley is a really shitty place (suburban purgatory) to be unless (a) you attend Stanford or (b) you're a venture-funded founder or VC. Without (a) or (b) you're likely to find the same anonymous corporate grind you can find in small-town Pennsylvania (where I originally come from) or a conservative, risk-averse European city.
If you find a specific job in the US then, by all means, come over. But my advice in general would be to find something of quality in the EU; it's probably easier for you, right now, to do that than to find quality in the US. You're not "trapped" just because TechCrunch and Valleywag aren't interested in covering the companies in countries accessible to you (the whole EU, I believe). Anyway, most of those VC darling companies are awful places to work. You probably over-value the Valley startup scene because you read too much HN. Most of the startups in the U.S. (yes, even in the Valley) are also hellish, overly bureaucratic for their size, and dominated by conservative MBA culture.
If you end up in a job that's "bureaucratic" after college, fine. Learn what you can. Use it as an opportunity to learn about people and how they work together. Figure out why it sucks. Keep the technical skills sharp and continue getting better at solving problems. Expect it to take years before any of this pays off. That's how it is for most people in the real world.
Good luck.