It sounds like you have a sex addiction.
You say,and I quote, " i mean i've only slept with 11 of them unprotected,"...that is a lot in case you didn't realize it.You make it sound like its normal and nothing...Most people do not have 33 partners.That is an addiction.
Also, it only takes ONE person with HIV to spread it and you can easily get it from one ,much less eleven! Your boyfriend is at risk for an STD every time you have sex together and that isn't fare to him.Use a condom.Make him use a condom and BE HONEST with him.He doesn't need to become a victim of your sexual addiction.
I think you need to tell him of your past so that he can get tested for HIV and other STDs . Early detection and treatment could mean the difference between being very very ill or being well.