Well, I am 22 as well, and in the last little while I have been realizing that it doesn't matter whether or not you leave your mark on the world. It will be erased along with everything else over time. It is inevitable. I am working on the meaning of life but all I can come up with is that there is no meaning to life. So much for being a theoretical physicist - the whole point was to make my mark by solving the great riddles of the universe but I'm seriously starting to think that is the big joke: you are forgotten one day along with everytihng else and there is no real answer to the origins of everything we know, and if there is, it is trivial and makes no difference. That sucks and I don't frankly get it but I really want to. So, if you fogure shit out please let me know. This does not really answer your questions per se, I guess what I am trying to say is don't worry about it. Do whatever is making you happy at the moment I suppose since one can never predict what will be. Fuck that was the worst post I have ever written. Excuse me.