I understand where you are coming from. It is hard to find good friends. I have gone through a lot. And it is so hard when you find someone you think is going to be a great friend and then they continue to let you down and blow you off. It used to really upset me, but I just let those ones leave if I have to do 95% of the work! A lot of my high school/university friends were like this.
I have a good group of friend now. We are all between 22-24 years of age. But they are the ones that stuck around through the years so I have weeded out the unworthy!
In fact, 3 of my 4 good girlfriends I have known since I was 4 or younger! So...that is how I know that they are going to last! Then the other one is actually a friend I met through one of my childhood friends and we click so well...like we are the same person split in two!
I sometimes feel like some of them aren't as invested in our friendship anymore...but when I really think about it I realize it is because we have different schedules. They work evenings and weekends and I work a full work week and have evenings and weekends off.
I am lucky to have a good group, but we can't always get together at the same time anymore because of work/school schedules and boyfriends. I generally see them one on one now. Things change when you start adding other things to your plate!
I hope you find some good girlfriends to hang out with. It really is a nice thing to have. Woman are great!!!