Even though you think you are not good enough to start a conversation in English, try. You may meet someone who is really interesting.
We know it's not common for Japanese to speak with people they don't know. But why not try speaking to a Westerner or a non Japanese?
It is OUR culture to speak with people we do not know, even if it's just a few sentences. Especially around the holiday season, many people want to speak English!
Have a look at some of the suggestions in this article and see if you can use them.
Remember, never give up!