Sidecar not working on my Macbook Pro Early 2015
I have a macbook pro early 2015 and an Ipad (6th gen) with apple pencil. The sidecar feature does not appear in system preferences and when I look for it in Finder it says "You can't open the "sidecar" preferences pane because it is not available to you at this time." I don't understand, I believe my equipment meets all the requirements. Both macbook and ipad have the latest updates and connected to the same apple id, and wifi. How can I fix this or where can I take it to be fixed? I can only use my apple pencil with pdf's in my macbook with the new markup feature, but sidecar is not working.
MacBook Pro 13″, macOS 10.15