Well, it depends what sort of people you are trying to make friends with.
I found that a bit shy people who are 'deeper' are actually better friends than some of these so-called 'social butterflies'...
Part of it may be cultural too.. I hear in America it's easy to get friendly people to be 'hi-bye' friends with, a friend who moved there from my country actually complained about it..
For me, it was easiest to form friendships at the dorm, these were not the very loud 'party animal' type of people.. we never got drunk together.. (I didn't drink at the time, some of them did drink occasionally) it was more about meaningful conversations and going to classes together and such..
It was a quiet flat in the dorm, or 'quiet' people in a loud dorm that we really 'hit it off' with, we had some common interests, sang with a guitar together.. It was really fun..
Some people, we just went to dorm parties together, it wasn't such 'real' friendship though, and wasn't so long-term..
Also, people with many friends may already have 'enough' friends, not meaning to cut anyone off, but it's difficult to honestly be friends with too many people at one time, while still keeping track of what's happening with who etc. So it may be easier to get friends who are 'new arrivals' from other cities or countries, and not at home there.. (But you never know, so keep options open..)
Sometimes it's enough to have just one friend to go places with, and others will socially accept you too.. Or you may meet new people through them etc.
Also know if you get too drunk or crazy around certain people (who you do not know so well) or tell them too much too soon (or they tell you too much too soon) they may actually be embarassed about it, so it's better to pace this and go slowly from getting to know you to getting drunk together.. (especially if it hasn't 'worked' previously..)
And know if people harass you to go places all the time or want to hang out too much, it can be sometimes annoying and 'difficult' too, lol... (Or bad for your studies/work..)
Another thing, people respond to enthusiasm better than to other things.. maybe something to keep in mind?
There are lots of other things you can learn about communication and such too..