Get the basics done first. English, math, and so forth.
If you want to work in Gaming you will need to learn 3d modeling or programming. The most common 3d modeling in gaming is 3d studio max. The most common programming language is c++.
If you want a job in "computers", I suggest you study towards a degree in IT. Hot subjects in IT include scripting/automation (especially Powershell), networking, and large enterprise software support (such as exchange, apache, Windows Server and Linux server OS).