How to not have any feelings for a girl and not get hurt by small things ? How to not care about girls but fool them into thinking I care ?

Well, first thing; you obviously have a very dated mindset when it comes to women, and that is your biggest obstacle. You're trying to make it out to be some kind of self-confidence issue, but the reality of it is that you are treating women like they are inferior to you, and your actions show that you believe they are only there for your pleasure. Whether you're ready to admit that to yourself or not, that's your biggest core issue. Women do not have to come to your desk, and you demanding that they do is a general f*ckboy move. Also demanding to be looked in the eyes; that is extremely aggressive. Women are not attracted to guys who do not respect the fact that women are people, with their own lives, preferences, wants and dislikes. It doesn't matter how many hours you spend in front of the mirror primping yourself if you won't spend any time working on your personality. You are not only demeaning toward women, but self-centered, insecure and jealous. I can see all of this about you, from one single paragraph you wrote. I can't imagine the kind of patience it would take to have to spend any amount of time around you, and commend your female co-workers for their powers of reservation. You also don't seem to have much to offer, besides being vain. You spend all of your time thinking about how to get women to do everything you want them to do, without leaving any time to delve into hobbies that would actually make you an interesting person to talk to. Women approach other men because the other men treat them with respect, don't down them, aren't aggressive or creepy toward them, and have actual things to talk about. You should look into seeing a therapist to get to the root of the cause for your scarily bad outlook on women, and utilize the tools and lessons you get from that.

I understand if girls are avoiding you. You're making them uncomfortable. You're acting stupid. Get your act together. Everyone, especially girls, can see through you. It doesn't hurt to be true and sincere. Try it for a change.