It sounds like it may be a heammoroid or pile they are external as well as into so if ur too afraid to see someone about it mayb try som heammoroid cream.. Xx
I have something like this too.
It looks like a large anal Skin Tag to me. http://www.whatscrohnsdisease.com/crohns-disease-anal-skin-tags.jpg
I was really ashamed too, but they're extremely common and pose not much of a threat.
However, this is just from what I can see on a small image. DR'S see these things and millions more a year. It's nothing to them, and they don't have personal opinions. Just medical care.
Take yourself to a clinic to get a real opinion :)
Hope this helps!