The Idea of Fixation/ Obession

I was having one of my random chats with a friend the other day. We had suddenly come to the conclusion that I tend to fixate on everything. Be it my job, my career path, the projection I have of my friends, the image I have for myself, a guy, ideals.... down to the most minuscules things such as the restaurant I frequent. I used to think that if I really believed in something, why do I need to be apologetic about it. But in realization on how many things I fixate upon, I am beginning to question. When the heck did this happened? It’s getting a bit out of hand....

"The critics talk of stubbornness. But you're just passionate" But what is the difference between passion and obsession?