Is it normal that i am a guy and i use sex to get people to do what i want?

I am a 25 year old straight guy. Whenever I can get something I want by having sex or by flirting with anyone (male or female) I do it. I am not particulary handsome, but I kind of have a boyish look... and I guess pervy old people love that.

I kind of grew used to using others by this method and I became quite cold about this whole issue. If someone is willing to give me money, presents or do me a favor, I do all I can to earn it. I don't give myself away so easily though... I only do this if the "pay" is good enough. However, at times I notice that I just enjoy using thse kind of people.

I guess I am like this because of my father. He left my mother for a suspiciously young woman. I remember that my father used to believe that he was such a "winner" for having such a young and beautiful girlfriend. And I remember my mother thinking "poor girl, she is just being used" about that girl.... However... I became friend with my father's girlfriend and realized that my father was the actual loser and that she was the one using him. I guess I still kind of resent my father a little. Maybe I am doing this because I want to get back at people like him.

The sad part is that I am quite indifferent towards sex. I don't think I have ever enjoyed having sex in my life. In fact, I have never been in love either and I have never kissed anyone with affection. I kind of want to have a girlfriend someday... but I have lost most of my faith in people... and I kind of feel like I am "tainted" and "unworthy" as well.

I know many women go ahead in life like this... but I haven't heard many stories about guys being like this... So I just wondered, is it normal?