YES - all four years of high school and 5 years with a psychiatrist. I'd go over and over in my head conversations I had with the person, conversations I planned on having, looking around to see if I'd run in to the person. Is this what you're talking about or is yours different? Drove me mad too. Finally got involved in truer relationships, ones where you know and care about the other person, and the other person knows and cares about you. I don't think obsessions are based on who the person really is, but more some perfect love that doesn't exist. I guess we obsess because it is unobtainable.