Yep, concur it sounds just like depression. I had a wee bout (maybe a year or so) with it junior year of college, and a little relapse about seven or eight years ago, and your description fits it to a tee. What I personally did to get out of it was to force myself to go out, be social, and do things that I didn’t really feel like doing. For whatever reason, that helped.
Another thing, since you mention wanting to travel and work abroad, the first time depression happened to me (and the most significant time–the bottom fell out of my grades and I got put on academic probation), I somehow knew that a complete change of scenery for me was going to do the trick. I darted off to work and volunteer in Europe for nine months, and came back a completely reenergized man. For some reason, being completely independent in a foreign country where I knew no one and having to rely on myself to travel, find work, etc., totally re-energized me and imbued me with confidence.
But that’s what worked for me. It may not work for you but, since you mention it in the OP, I do want to extend to you my experience. I probably should have seen a psychiatrist, but it never occurred to me that I was depressed. I just thought I was bored. Looking back at it, it was certainly some form of depression. I went to a psychiatrist a few months after I returned, because I feared slipping back (I had a romantic set-back and I couldn’t afford to spiral in to the same pattern as last time). She put me on Prozac for two months, confirmed my suspicions about my previous depression, but I eventually just weaned myself of the meds (with her approval.) Seems like either it was a false alarm the second time around, or the minimal amount of Prozac did the trick.