Territorial

Does anybody else have this problem? I'm extremely territorial about my space/things. I hate people invading my space such as my room or wherever I may be sitting without invitation. I hate people touching my things or borrowing them without my permission. I absolutely despise things being out of place and disorganized. I don't yell at these people or make a big show of things, but it's like the anger simmers inside of me. I'm a nice and friendly person, but when something is mine or when my space is invaded I get unnecessarily anger on the inside. I've always been this way, but as I age and have more things that are truly mine, it's gotten worse. I don't know why I'm like this.