In 2 days its my 21st birthday and i dont want People to think they have to care about me

I can tell you what might, and probably will happen.
You don't say anything, you don't put a facebook notification, you don't tell anyone.
Your birthday comes, and only your closest friends wish you happy birthday. Lets say you have five close friends. You get five happy birthday wishes.
Next year, you do the same, except this time, one of your friends is busy and another forgot. You now only have three happy birthday wishes.
The year after, all your closest friends are busy, forget, have other things to do, and no one wishes you happy birthday. You feel bad because now it seems no one cares at all.
This is exactly what happened to me after I disabled my facebook birthday.

/r/depression Thread