How do I make sreen smaller letters are so big I hate it. I already tried adjusting font size (dpi) it didn't work

You need to adjust the screen resolution. How that is done depends on what operating system you are using.

What you need to do is go to the control panel on the administrator, if you have more than one user (on the main user). If that does not work on the bottom of your screen there it usually some buttons just mess around with them