Q: Google is my default search engine but my search results always go to yahoo. How do i change this so its always google?

Open Safari Preferences>General (COMMAND + ,) and select Google as your default search engine.

Ciao.

What does it show?

This from mine.Ciao.

If your 'Default search engine' is shown as Google and Yahoo search is always appearing, I would delete Safari and re-download it.

https://support.apple.com/en-us/HT204416

It works as shown on my Mac.

Ciao.

Do not delete Safari, which you can't do anyway, as you already know if you've tried it.

From the Safari menu bar, select

          Safari ▹ Preferences... ▹ Extensions

Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.

Linc Davis wrote:

Do not delete Safari, which you can't do anyway,

Apparently you have missed reading this article:

osxdaily.com/2012/02/05/delete-safari-mail-facetime-other-default-mac-os-x-apps/

You will note that safari is included.

Ciao.