I have something to get off my chest.
I am a little afraid about what you may say.
Yes you might be, but if I don't get this off my chest, I'll burst or something
If you must get off your chest then go ahead and do it, it's good to get things off your chest. If you don't get things off your chest you'll become stressed out.
Okay I think I'm infected with HIV
Well I am glad that you do not have to hold that in anymore! It is ok. Just make sure that you let anyone know who you have sexual relations with that you have HIV so you can practice safe sex.