From a portfolio point of view, if you have plans to work with real-time environments and/or models (games): add asset breakdowns. These should include for example, wireframe renders, texture map renders, etc. This will help showcase that you can create production-ready models and not just good looking still renders.
Don't be afraid to get passionate, really really passionate about your craft. And by the same token don't be afraid that you aren't taking it seriously enough. Show it off when you're proud of it, and even when you aren't really. You're young, and most of the way you get things is by asking your parents for them, yes? This…