Always having him on your mind doesn't mean you're obsessive. If you restrict him about who he can hangout with, you're being over protective, if you say anything that O.A.G says.. You are. Google O.A.G, look at pictures. Do it.
Your clinging to him all the time (kind of like a monkey) you don't let him hang out with friends, every time he looks at a girl you get mad at him, if you do that then that's over obsessive and over protective