Yes, you can delete your own Google review.
To do so, sign in to your Google account and go to the “My Business” page. Find the location where you wrote the review, click on the “Manage reviews” link, and then click on the trash can icon next to the review.
Remember that once a review is deleted, it cannot be recovered. So if you’re not sure whether you want to delete it permanently, you may want to consider editing it instead.