I had studied Japanese for about 2 weeks when I arrived in Japan as a 16 year old exchange student. The first 3 months were the most fun, trying to work out what my friends and host family were saying. Knew nothing about Japanese music etc but my friends had fun sharing all of that with me and finding out what I was interested in. You'll be fine, just keep smiling and putting in the effort, you'll get as much back as you put in.