Hi, you are only 19 and have plenty of time yet to decide. My son is 24 and has only recently qualified as a chef, which luckily is on the shortage list. He still needs to gain 5 years work experience though so he's going out on a working holiday visa for 2 years and hopefully can get sponsored by an employer to stay for permanent residency. If not he'll nip over to New Zealand after to gain more experience.
I would suggest if you really want to go, then just get a working holiday visa first, try it, see if you like it and hey, it might lead to better things. There's also the option of studying out there too if you do eventually decide on a career, or you could meet the man of your dreams!!
You only live once... Go for it and good luck