A good choice for certifications is the MCSE, which is one of the Microsoft certifications. This test comes in a series of tests, so you don't take all of them at one time. There are many certifications to choose from, so once you choose what you do with computers chances are you can get certified in it. It may take a while, but all the cramming and studying you did will pay off. Companies pay very high salaries for people that know how to work well with computers and have their certifications.
Computers are in a field that is literally changing daily.
There is always new technology available for us, so my advice to you is learn today's technology and keep your ears and eyes focused on the future technology. If you keep up to date with the ever-changing computer technology you are truly adjusting for the future, and are prepared for later on in life. Don't be afraid to learn something new, because what you know now may not be the standard six months down the road. Most people who get involved with computers early on in life, and get a heads up will definitely be ready for what lies ahead. Computers are now, as well as the future.