Yes, having an account on github or launchpad is like having a portfolio if you're an artist. It's excellent. It shows you have done some good stuff. It's good to build up this body of work.
But, don't get obsessed with this to the detriment of your other college activities. You'll have a lifetime to build up your github account, but you'll only have access to your college's faculty and other resources for a little while longer. Exploit that access!
Your existing github / launchpad accounts prove the point that you're serious about software. This gives you the freedom to spend the rest of your college time really stretching yourself. Take some classes that open you up to new ways of thinking. They could include advanced math, history of medical science, who knows what? Something completely different. The kind of perspective you'll get from that will be very helpful to you 15 years from now when you're ready to start your own business.