Don't be proud, don't compare yourself to others, enjoy life and live with composure
「おごらず、人と比べず、面白がって平気に生きればいい」は英語で「Don't be proud, don't compare yourself to others, enjoy life and live with composure」という表現が良いと思います。
おごるーTo be arrogant
おごらずーDon't be proud・arrogant
比べるーTo compare
人と比べずーDon't compare (yourself) to others (people)
面白がるーTo enjoy・To delight
平気ーCalm・Self-possesion
(平気に生きれるーLive peacefullyという翻訳も使って良いと思います。)