My cousin invited me on a trip. Should I go?

I’ve never been out of my hometown before, so this is kind of a big deal for me. My really well-off cousin is here visiting us after nearly seven years. We got to catching up and he told me all about his travels. Meanwhile, all I had to share with him was my menial part-time job and my uneventful high school life. He told me he wanted to take me with him on a multiple city singles tours trip in Europe, with all the expenses paid for. I don’t know what to do, should I go? After all, I think it’s a good experience before I head out for college. I’m just really nervous and don’t know what to expect.