help telling my parents about new friend that is a girl

Hi, I really need help. I have this really good friend who is a girl (im a guy obviously). We are not officialy boyfriend and girlfriend yet. I was just browsing on Yahoo Personals one day to kill time and I ran across her profile. She is 22 and I’m 18. Four years in age doesn’t bother either one of us. I have to find a way to tell my parents about her so that they’ll trust her…and me for that matter. She is working on her Ph.D in child physcology (if I spelled that right). She is in graduate school right now. I have no doubt in my mind that she is level headed. I mean she has to be to make it through graduate school. I am a senior in high school this year. I am going to be going to college next year in the same city where she lives (about 30 miles from me). We want to just hang out as friends right now and see how it goes. How do I convince my parents that she won’t “con” me into having sex and all that? My parents know I also am level headed. I don’t screw up all the time and get into trouble. A)I know she won’t “con me into having sex and all that and B)she is just not that “kind” of a person..if you get my drift. I have talked to her on the phone a lot as well as online. We are planning to meet at a mall that is in the town where I live on this Sunday. I was planning to tell my parents about her after we meet in person. Do you have any ideas how to make my parents trust her…and me? Thanks in advance!