Every girl is different, so there are no surefire ways to get "a girl". Some girls fall for intelligence, some girls fall for artistic talent, some girls fall for independent men with lofty goals and ambitions, some for muscles, some for good looks, some for money, some for guys that can make them laugh, some for anything they can get, some girls act like they aren't interested but if you persist then things change, some girls just aren't looking for anything serious, some girls are only looking for something serious, and a lot of girls find it very hard to trust men.
So what I'm saying is, there's nothing you can do to get a girlfriend per se, but you can be sure that there is SOMEONE out there who is waiting for you, who you will be with someday, and in the meantime
You Might want to start looking for a girlfriend that is right for you - instead of "a girlfriend". If you're looking for just sex, that's different: go to college parties or inner city nightclubs or festivals like those in New Orleans or Rio if you really don't want to pay for it. But if you're looking for a serious girlfriend, then your "100 rejections" might have something to do with it.
Maybe you're moving too fast?
Maybe you're looking for a girlfriend for the sake of having one, not because you actually like the girls you're pursuing as potential partners. That seems to be a problem:
You Might want to seriously think about being more picky about who you pursue, and really putting some time into building friendships with girls you like, getting to know them, finding out what they're looking for, and if you think it is you, then building on that friendship.
Most of your guy friends who have hot girlfriends will either be miserable with them, or just with them for sex; most of them will split up eventually, and be in the same boat as you at least for awhile. Forget what they are doing and worry about what is best for you, what you want, and WHO you want.
You'd have to give a lot more details than you did if you want any more advice than that.
Fox