Do you know what kids will be going? I ask because if it’s a group of kids that already know each other well, and they tend to be exclusive (meaning not inclusive), and they are all planning to have a great trip together as a last hurrah or sorts, you can end up feeling like a third wheel. However, if there are a bunch of people, or even a few, that aren’t a part of the “we only hang with our own” crowd, I think you could have a great time.
Once you get to college, take all the travel opportunities you can. People will not be in large, already cemented groups, and they won’t be going into travel with the same mindset they do in high school.