Exibitionist

My younger brother called me an exibitionist and I guess I must be, but can't help the way I feel about it. For the last year or so my brother and many of his friends have seen me naked. I do it on purpose but I try to pretend that I don't know they are watching me. I have even let some of them see me masturbate on my bed. I leave the bedroom door open just a few inches so they can see into my room. When I know my brothers friends are in the yard I make sure the bathroom window is open enough for them to watch me in the shower. Lots of times I masturbate knowing they are watching me and have even shaved my pubic hair as they watched. I am a couple years older than they are and I do know they like looking at me. My brother told me I am crazy but he is not mad at me for doing it and promised not to tell my parents. My brother is so used to me doing it that I get him to bring different boys to our house when no one else is home. There have been at least 12 or 13 different boys so far that have seen me naked. I am afraid now though that to many other kids know about it and are now asking my brother to bring them to my house. I can't help getting so aroused when I expose myself and do know its wrong to do. I keep telling myself I won't do it anymore but as soon as I know my brothers friend or friends are there I start all over again. Even our mailman and the men who cut our grass have seen me naked a couple times. I never do this when my parents are home but am afraid they will find out some day. It also causes me to masturbate frequently just thinking about doing it. My girlfriend told me her brother saw me naked a few weeks ago. I acted as though I was supprised and pretended to be embarrassed that he did. I don't know why it thrills me like it does and there must be something wrong with me. My brother just tells me I am crazy all the time but he said he likes to see my body anyhow. I did let him watch me masturbate one time but told him I wouldn't do that anymore. I don't get excited much when my brother sees me naked but when his friends do I get aroused right away.