Anyone ever tried Plenty of Fish?

I found it useless. It was my last hope. I said Id never do it. My therapist told me to try it. It was one rejection after another. Typical. I think theres something really wrong with me. Girls just arent intersted in dating me. They say they are but back out at the last minute. I come to expect it now. Ive been single for a year and only in one other relationship that lasted a year before that. Total relationship experience year and a half. Thats it. Tons of people say that Im really good looking and have a ton of attractive qualities. Im not nearly as shy as I used to be. I see other guys with girls and theyre not perfect. But girls seem to expect perfection from me. They end it after about 2 weeks now. The last three have been that way. Everytime I make the smallest mistake or say something they dont agree with. THey never want to talk to me again. I dont understand. Im polite, honest, open, got a good job, good family, dont drink or drug. What wrong with me?