[geezer]

If foreign students want to make American friends, they should be prepared to feel uncomfortable and also be willing to make others uncomfortable.

There is no easy way. You have to separate yourself from your comfort zone. That includes others from your home country as well as other international students. Live with an American roommate, go to every (American) party you are invited to. Say no to every (non-American) party you are invited to. Find an American gf/bf or keep trying. Join volunteering activities (food drives, blood drives, salvation army etc) to meet locals.

In a couple of years, you would have made yourself deeply uncomfortable on many occasions, annoyed some people, but by now you'll be talking and walking like an American.

This applies in general to immigrants who tend to huddle together because it is the easier thing to do. That is why in most cases, cultural assimilation takes atleast a generation.