What happens after August? Does the internship end and your visa expires or were you able to secure yourself a permanent job in the US? The reason I ask, is because, if the time is limited, your options are even more so. Meeting people is one thing. Even having a fling or two is a very realistic possibility time-wise. But making friends or any friend at all that is worth half a penny, takes time. It could happen, but it is not something that you do or that you make happen.
We say we make friends, but we really don't. We find each other, after lots of interactions with all sorts of people. There is beauty in it, but in reality it's usually quite messy. There's no algorithm, no code, no debugging. There's heated arguments, lighthearted fun, fights, all is game. But when you care about someone enough not to want to lose that person, and he/she also feels the same way, you know you have a friend (sometimes a partner). Friends forgive you if you are being an idiot. You usually have to apologize though. You put yourself out there and sometimes you get hurt or really mad. Other times, you just get to experience the wonders of true friendship.

But, I have to ask you (rhetorically), what have you been thinking? (And now the part where I answer my own question) I am making an assumption here so feel free to call me out on it, but my feeling is that you didn't think making friends was really that important. You see something now, that maybe you didn't before, and you suddenly want that.
I had a conversation with a cousin of mine long ago, and he was smart (in school), but he didn't have any friends. And so once I told him, to forget about lots of the idealistic stuff he had going on in his mind all the time, and to make friends, because there lies real value. That was very sad to see, but then again, that was his choice and we are accountable for the choices we make.

Now, I am not saying you are like my cousin, but I bet my right arm and leg that you had more than one chance during your stay in college or at work, to make friends. But you didn't. So you really need to ask yourself why and not make any more excuses if you really want to change that.

As someone else suggested, at your age, most people have already made their friends and are not likely to invest in making new friends. Acquaintances sure, but for friends, that train is gone (mostly). But do you know why? It's not because of a first come, stacking kind of logic, where once the stack is full, you're done. It's because becoming friends with someone can be exhausting emotionally, and most people tend to have some resistance after twenty-plus years of trials and errors. It's not the same with finding a partner, since people of all ages are looking for a partner, so that is actually much easier.

If you are serious about wanting real friends, be ready to work for two.

People you hang out with just when you feel like it, are not friends. They are more like acquaintances. Friends are those people you hang out with even when you don't feel like (in many occasions). I don't want to turn this into a discussion about acquaintances and the different types of friendships though. All I am saying here is that you are not a friend with someone because it is convenient. I hope I could get this point across.

Next up: language. Honestly without hearing you speak, there isn't much to say, but you can write fairly well. I am also guessing that you can understand everything people say to you when they speak. If that is the case, as long as you don't speak in an incomprehensible way, people won't care much. Still, it's good to work on improving how you sound and to be both modest and confident. People tend to shy away from people who lack confidence (and from those with too much of it also, although not always).
There's a book called American Accent Training, with a nice American flag adorning the cover! For Asians that talk in a non-flowing manner, it can be of great help.

BTW, conversation is not about how you pronounce something, but about what you do and how you do it. Listen and show genuine care, or to put it bluntly, "give a damn". Learn to do this constantly. Don't try to fool people. If your interest is not genuine, a real relationship will not come out of it.

Don't give up ever, act, and things will happen. Maybe not tomorrow, but then it is just a matter of time, and time is still on your side.