Whatever the hell you want! You play pokemon, you have an imagination! Rock this shit man! Plus you don't have to go outside to do things, you want to continue education? Kahn Academy. Want to create something amazing? You have an interest in computers, why not look up tutorials on how to program? Here is a free website to get you started on Java Intro to Java. Don't feel like learning new stuff? No problem! Have you tried your hand at writing? Using some of your creativity to create something. Short stories are always a blast to read and write, got writers block? Draw from your hopes dreams and wishes or read some great books(might I suggest The Hobbit and then Lord of the Rings?).
You have a unique life that you have lived just like everyone else has had their own unique experiences. They are all interesting in their own right, don't feel like what you have seen and thought is anything less than that.
Stop looking at life as a competition. Others can have good things and there's still plenty for you.
Read the Nicomachean Ethics by Aristotle. If you have questions about it, message me, I can probably answer them.
Learned Optimism may also be helpful. It certainly helped me pay attention to/change my own internal dialogue to more closely align with the way an optimist would frame a problem/setback vs. a pessimist. For me, this is one of the books I think of when people ask what books have significantly changed me.
It seems like you need to find some direction in your life.
You invest most of your free time in meaningless activities that do no good for anything outside of yourself. That's a problem.
While your physical exercise is a positive activity, it's ultimately not going to bring you happiness by itself. The real value of exercise is that it enables you to more easily accomplish other meaningful things. You're "sharpening the saw". A fit person has more stamina, makes a better first impression, is more influential, and less prone to downtime due to illness.
You really need to discover who you are. What you are about. What you want to accomplish in life. What do you want people to say about you at your funeral?
I'm sure there's an infinite number of ways you can turn your life around and discover happiness. I can volunteer one way that worked for me.
I bought a copy of The 7 Habits of Highly Effective People by Steven Covey (recently deceased, bless his soul) and a journal. The 7 Habits is not a typical self help book; it's about building character and finding direction in life. I dedicated myself to implementing and internalizing the teachings in this book. I would typically read a paragraph or two and then stop and spend an hour journaling how each concept applied to my life and thinking, discovering and reinventing myself in the process.
This kind of self study is a very positive process and far more rewarding than nonsense like obsessing over strangers' facebook lives.
Take care