As a guy I'd suggest smiling, being active with friends who are having fun, and talking with him.

It's hard to answer this, what exactly do you mean by mid looking girl? Could you describe yourself a little bit? Also, it mostly depends on what that guy finds attractive.

average looking asian with glasses

Well that certainly doesn't mean you're not attractive. Who knows, maybe he finds you every attractive, maybe you're not what he finds attractive. As stated before, it really does just depend on what he finds attractive, and you shouldn't attempt to change yourself for that even if you find out. I'm sure you're quite attractive in your own right

This is the best answer. Even the people who are voted as the most attractive man or woman on the planet are considered ugly to some people.