help

Honestly try hanging around the house more, like during chapter dinner or if they offer Friday brunch. Or just study or hang out there. If you were assigned an initiated member as a sort of surrogate big, try to see if they'd be up to doing something with you, or talk to them about how you're feeling. But most importantly, try to make connections with the girls in your pledge class, i.e. the other new members. It's these girls that are going to become your closest friends for the most part and are going to shape your sorority experience the most.

It is overwhelming and some adjust faster than others. You can't expect to fit in right away and be besties with everyone. If you have a defeatist attitude you aren't going make friends.
It can be expensive and if you don't have the support of your parents and your already on the fence, it has to compound all the feelings your having.
Instead of thinking you have to make friends with everyone, try to focus on one or two pledges and one or two actives. You sound a little social challenged, look for girls who are similar to you, make yourself find a go to person. Once you find someone who you can conncect with, then like the above post suggested go to the house with them have lunch study or just hang out. . And talk to the treasurer maybe sure can give you some more time before you have to pay.
The more involved you are the more you'll make connections with the girls and bond. So make yourself shake the negative vibes, (maybe that's another reason why you're not connecting others can sense it) and give it a week or two of extra effort. good luck

get to know your sisters!

You don't have to be in a sorority. There are much better ways to get involved and make meaningful friendships (i.e., friendships that aren't dependent on making payments).

Don't quit, that's the easy way out, suck it up and pay the dues. Yes people say you're paying for friends, but until you get the full experience you'll understand why it's the best money ever spent!
Belong to a sorority is very individual and what you walk away with what you put into it. So if you are think that you're paying for friends, yes you need to drop out and be a quitter. For the rest of your life you'll always wonder what if I stuck it out. What if I gave it my all.
Right now most pledges don't feel like their wanted, it's up to you to change that and go meet the girls in your house.
Find someone in your dorm or close to it and make an effort to go to the house together, be involved and it will change your life.