Listen dear, A career is different from a job. The thing is though you have to know which art form you specifically wants to do. When a person looks at your art profile they're looking at many different things, it's all depends on what you're launching as a career. For example if you want to be in digital art they won't look at how well you can draw but how well you can handle a program. So in the end i'll say this, every one can have a career but you have to know which one is for you.
All of the things you listed require different and specific skill sets. If you have your mind set on a particular art career, you'll need to focus on developing the skills necessary to do the job and a portfolio to demonstrate those skills. Awesome drawing/painting skills won't get you a job as a 3d modeller, for example.
Oh I am in high school too! Are you planning to get in art college, And then get a job?
I am going to art college after Graduating high school. Well,. I am not sure if I should do it or not.. Because my mom does not like me draw and wants me to go business major,.. Meh
Anyway I am free lancer while attending high school, and worked for various jobs like online game, illustration book etc. I believe this would be nice for my college/job portfolio in future so freelancing would build you good work experience (as long as it doesnt affect on your grade)
And draw other styles so you can get MORE clients -- anime, semi realism, pixel, realism, traditional and digital, pencil and water color, etc.
I have many different styles so ppl think it's not drawn by the same person sometimes xD;; but make sure you develope one unique own style which would be your major!