You are a waste of oxygen?? Man you haven't seen people who really are a waste of oxygen. Man atleast you had a purpose for 10 years. And only because you had enough guts to go through that path you are here. What if you choose another path, a path you didn't actually like. You will be far more disappointed. Nothing is easy and sometimes we don't get what we wish. So what? No one will be there for you and for the people who love or depend on you, only you. And if you look enough there are people who has worse situation than yours. Do they think they are a waste of oxygen? No. They seek and try to find the next step. And make it work. Your job your passions is not only the things that defines you. And did you really waste 10 years? You choose it and you like it. And no one can really predict what happens after 10 years before it happens.