Your experience is the norm do not worry about it. Me and my roommate both tried the site and I have seen many girls on the site I went to college or high school with. There are 2 major problems with online dating in my experience as a man:

The free websites (okcupid and pof)
It is hard to tell if anyone on this site is real. Not having to invest money in a profile leaves room for lots if fake users and low-life's. I had only one relationship out of either site and I feel it is because I was under such a dry spell if activity so I became desperate. The lack of investment leaves people with a mentality to come and go as they please. The girls that reply are often unattractive or have kid/kids or are bi. They usually have some sort of vague artsy fartsy sounding profile as well. 3 years I have tried to build a stady conversation and get the phone number and suggest a date. It rarely happens. They often cancel at the last second

The paid website (match.com)
I have only been on this one a month and a half, but I was shocked to find the experience is the same as the free sites. The only difference is the quality of women seems to be higher. They often have good paying jobs and are attractive, but they seem to be swallowed up by their career. I met a girl from art school on here and tried to reconnect. We were acquaintances and had a lot of mutual friends in common. Turns out she moved back to my home town and she was friends with a lot of people I had played sports with and mutual best friends from high school. She was excited I remembered her and even got her number. She made an excuse to cancel our date. I let time go by and rescheduled and she burned me again. The same recurring thing keeps happening to me no matter who it is.

I am not crazy nor do I act very desperate. I have lots of friends and I know a lot of people. I don't know how I got suckered into online dating. I had a lot of jobs working with only men, by myself, or young girls. I am a little behind in my career compared to some my age but I consider myself hard working and somewhat attractive. I'm very outgoing...hell I was prom king at my high school. I feel completely stuck at this point. I hang out with many friends who have girlfriends but they never seem to have attractive friends without huge baggage.

My final words are its them, not you. Guys are looking for a good date. Girls are picking out the perfect date and they don't care if they cancel at the last second and destroy your night or weekend. You're better of without it