I can put 1920x1080 in game since im on 16:9
Make sure that your monitor is actually 1920 x 1080. Being just 16:9 isn't enough, it could be some other, but similar resolution like 1280 x 720.
Make sure that you actually entered 1920 x 1080, these exact numbers. Not 1921 x 1080, not 1920 x 1070, not anything else. Mistyping even one digit may cause problems.
The point is, you must set a resolution that precisely matches a physical resolution of your monitor, not completely random numbers like 1640x1640 or 1980x 1980 or even 3200x3200, not even close estimates like 1921 x 1080.
en.wikipedia.org
My game will have black side
Does it look like this:
?
If it does, open
Windows technical FAQ/troubleshooting guide and scroll to "
Issue: Mouse is acting weird, movement of cursor on the screen doesn't match mouse movement. Image is cropped, you cannot see right and bottom sides."
Otherwise, upload a screenshot to this thread.