From the point of view of people who have lived in Japan, someone who hasn't been there but says "I love Japan and wish I were Japanese" comes across as not entirely lame perhaps, but naive and uninformed. You love your image or idea of Japan, which may have little to do with the reality of every day life here.
If you were Japanese and living in Japan, you might be too busy with your 3-hour daily train commute (standing all the way) and 14-hour working day, or the long hours studying for high school and university entrance exams to appreciate things like manga and anime as an insider.
I enjoy living in Japan most of the time (I have been here 11 years), but it certainly has its ups and downs. There is a lot about the culture that I like, but there are plenty of negatives as well.
Good luck with your dream to come to Japan, and make sure you don't just look at anime and manga- read an English-language Japanese newspaper online from time to time so you get an idea of the issues that people here actually face on a daily basis- I'm afraid you won't find that in anime or manga. Then you will look like someone in touch with reality, not an idiot!
