Airlines: At last some good news! Different airlines have different policies but many (probably most) will be happy to let you travel. Ryanair, for example, refuse to carry unaccompanied passengers under 14 years of age and impose rules regarding the carriage of 14 & 15-year-olds but, at 16, you get your liberty. So, at last we've got you out of the country! ( . . . as long as you weren't planning to travel to Portugal of course!).
So you arrive at your destination. What's next? Obviously it's the transfer to your hotel. Here, at least, you shouldn't have any problems. Whether you're travelling by bus, train or taxi, there shouldn't be any problems with transport to get you to your hotel (but see my note below about costs). Which leads me to . . . .