Try to socalise more with girls and just talk to them.
There will be girls that are easier to talk to than others.
Talk to the waiteress and cashires and other women you meet in your daily life, just start by saying hello and asking if they are having a nice day.
Girls your own age are harder to talk to, older girls, in your case college girls, will be easier to have a conversation with.
The most important thing I find is that you only talk about what you know, dont pretend to know about something you dont.
And let the girl talk about whatever she wants, usually girls like to talk about themselves, and let them.
Just ask them about the college (or high school) they attend, as if you are interested to go there when you are applying to colleges.(If she goes to an all girls high school she probably is as uncomfortable talking to boys as you are talking too girls)
From there the conversation can go many different ways, toward sports (only if she play's a sport), towards general college life (if she lives on/off campus, things to do etc...).
If the girl is talking about something(or someone) you dont know about, tell them you dont know ablout whatever/whoever it is.
That lets her continue the conversation, and make her feel more intellegent, teaching you about something/someone you dont know about.
Eventually the basics of introducing your self and getting a conversation started will be easy.
Dont let your friends pressure you into talking to a girl, you choose the girls you want to talk to.
Dont go to partys with the intention of finding a paticular girl to date/girlfriend/hookup.
Talk to as many of the girls at a party, learn as much as you can about them and dont be cheezy/hitting on them.
The moral of this long winded post is..
If you are comfortable talking to girls, eventually you will be talking to the right girl, and it will be much easier. She is the girl you will ask out.