It's not really a problem if nothing totally grabs you in year 10 - most people I know picked their specializations without being crazy about their subject, and it worked out after.
What matters more is thinking about what you like doing day-to-day (even if it's just "I like staying focused" or "I like working in groups"), and then looking at which specializations fit with that.
Like for me I didn't discover my passion for cycling until first year of uni when I started really analyzing how stuff worked, it can come later too. If you're comfortable everywhere, honestly you could just pick based on what bothers you least and whatever career paths vaguely interest you - it's not set in stone anyway.