You can do WHATEVER you truly wish to do... If you believe you can do it, if you have the ability to focus on it with consistency, and are willing to do whatever it takes to make it a reality, then you CAN do it-- its always been that way-- you've created many things in your life. So, stop making excuses and just do it already: fill out the application, go volunteer, copyright that idea, file the patent, book the trip, ask her out, share the idea, write your book, take that all important first step... In the end, we will regret not so much the things we did, but rather what we DID'NT do. (Go for it-- life is short)