In the same boat
I feel for you man, I was there for two weeks this summer and had the time of my life. I miss everything, especially the friends I made there. I also found myself to grow close to alot of the other people on the homestay trip(which I diddnt expect at all at a first glance). The very second I stepped off the plane and viewed the Portland airport, I was in deep sorrow.
This may be a bit bold but I compare my experience in Japan to an experience with ecstasy. I had the time of my life there and I may forget things I did in Japan, but I will never forget how Japan made me feel. Something in japan opened me up along with the others who were in my group, we grew very close. I have left the country with a pair of eyes that were never in me before. I almost feel sorry for my friends. Returning home was like a big crash for me, I cant wait to return.
I was ridiculously alive in Japan.