we're in a huge crisis over here too... when it hit, it hit the USA first and our problems infected your part of the world...the economic crisis is what caused me to get out of full time music and pursue a healthcare career, but I am not making what I ought to be lately (though some of that's related to wanting flexible hours for a workplace very near to my house for Dad reasons, but generally my industry is downsizing and salaries are shrinking or at least not increasing with the added responsibilities stemming from the 'streamlined' staffing)
as far as your situation, I am really surprised to hear there is no summer work of any kind for someone your age, those are the jobs that never seem to disappear here (sweeping up shops, stocking shelves, lifting packages, inner city bike messenger work.... all for shit money, but those kinda gigs are around and small businesses love to hire the kids under the table for less than minimum wage)...
some of my first jobs were a bit unconventional back when I was your age, I think my 1st job was designing/building sets for a local theater company that ran a summer acting workshop when I was maybe 13ish and I went on to work for those people building sets for their adult productions as I got older... I eventually took over from the adult who supervised me in the beginning, particularly as I got good with power tools and not just the decorative aspects. I also learned a lot doing it, knowledge that's been incredibly useful to me as a techy type of guitarist. I think I found that thru my school or a youth center and then talked my way into a paying apprentice gig, but these days the internet is a fantastic resource. The electrical skills I learned wiring working outlets and such in 'living room' type sets actually wound up landing me my 1st recording gig in my freshman year of college. Its a long story, but I saved the day at an event put on by a guy who owned a small studio and indie label... I ended up being the office manager, personal assistant, cleaning man and repair guy for him and I got to sit in on his sessions and learn eventually becoming the assistant engineer.
Take a minute and think about what kind of unusual skills you have that you might be able to market and then search craigslist or your European equivalent for opportunities. Just don't oversell yourself :-)
another thing to consider is jobs with weird hours.... for a while I was the doorman/bag-checker at an all ages nightclub which fit with my teenaged night owl tendencies, required no skills whatsoever and provided an excellent opportunity to meet people involved in local music and arts... all the networking I did at the door allowed me to setup a thriving graphic design business creating flyers, posters and t-shirts for local bands and music events...
of course I worked at a starbucks over the summers in highschool too, music can be an expensive mistress and I was always trying to double or triple up my revenue streams, but even if there are no legit jobs to provide you with that smallbut steady income, I guarantee you that if you are clever and industrious you can make money all summer... no matter how bad the economy gets (and in the 90s we were in a nasty recession here that lasted into my college years, it took me a long time to get that steady starbucks gig as the competition was fierce for unskilled work) BUT there are ALWAYS to make a little money here and there as long as you make it a priority to find them. There are creative types out there servicing the entertainment and artistic needs of the 1%ers in every country and those creative types might need an apprentice. Work cheaper than a guy who knows what he's doing and state you are eager to learn! Your help might involve sweeping the floor for a local luthier in his home shop or maybe just moving equipment for sound reinforcement companies or wedding DJs (I've done this one, shit money but a great opportunity to learn about live sound).
I dunno, I'm rambling at you, but in a bad economy you may need to think outside the box to have an income as a kid, but it can be done. Just don't get discouraged if you get shot down a few times... and don't be greedy. Take whatever you can get and try to learn along the way. Ask lots of questions so that down the line you can start trying to make more money with the skills you will acquire or refine....