Grease Pencil and also curves don't appear whenever i try to draw with the grease pencil or use a curve it doesn't show up in the view port, it dose shows up in the library. 
I have tried restarting and still nothing works. I would love any help.
Thank you.
One reason for missing annotations can be the fact that they are disabled in viewport;


Check your 3D viewport upper right corner menu, see if annotations is checked or not.
Or change Active workspace tab - Layout and Modeling tab for example show annotations by default.