What Am I Doing Wrong?

For years now I've been battling the game we call dating. I'm 23 years old and I've only dated three girls and I've only had one true relationship. I never dated or talked to any girls in high school. I dated my first girlfriend at 20. It lasted only three months because I found out she still had feelings for another guy where she attended college. As soon as she traveled back to school I dumped her because of it. Four months later I dated another girl. It was by far the most loving relationship. It lasted five months. I walked in on her with another guy and left me for him. About a year later I met a new girl. It was by far the funnest relationship I've had. She seemed very indecisive and "wishy washy" but I always gave her time and space. After "dating" for a few months she finally gave me a straight answer. A month later she broke up with me before she traveled back to school. She told me she had a lot of fun with me and I was a great guy..but I was too nice. It's been almost a year since then. I was close to going on a date with a girl I met at my gym. She wouldn't give me a straight answer until a couple of days before our date. Of course, she said no. We still spoke on occasion after that but she continued to play her weird, prude games and I stopped speaking to her. I've tried talking to several girls at my gym and none of them seem interested or they give me a nasty attitude. My friend and his fiance tried setting me up with one of their friends tonight. My friends fiance kept stating that she was excited to meet me because I seemed like such a great guy. When she finally saw me, it was a 360. When I tried striking a conversation she wouldn't carry on with it. When we left I told her it was nice meeting and she said, "you too." I was thinking...REALLY? I asked my friends what her deal was and that wouldn't give me a straight answer and said, "Don't worry about it." I just don't get it. I'm not like the majority of guys my age. I have a REAL job that pays 40k a year, I drive a Mustang GT that turns heads, I have a beautiful apartment in the city, and I'm still going to school to improve me career. I have many friends that haven't had the luck I've had. Many of them meet women all of the time. I have one in particular that has a great physique and attracts women all of the time. He's not very outgoing, doesn't do anything that may hurt his image, and isn't very sensitive to other peoples feelings. The women still love him. I even went online and made a profile on a dating site thinking I could meet someone there. I kept my profile for about two months and never received any messages or replies. I just don't understand. Am I being smothered with bad luck, am I meeting the wrong women, or is it something possibly about me? Ladies..need some advice. Thanks.