Reassure yourself that there's nothing wrong with your life simply because others have good news to share. Life ebbs and flows.
Stop the notifications, or at least reduce them. You'll lessen the distractions that pull you away from being present in your life.
Set up obstacles to create distance between you and social media usage. The added bonus? You can't see updates if your screen is turned off.
Fill your time by learning a new productive skill. You will feel accomplished in your efforts as well as enjoy some off-line time.
Keep your mind involved in where you are. Participate in conversations. Literally smell the roses. Value the moment instead of the selfie.
Be intentionally thankful. When you appreciate the goodness in your own life, it's easier to celebrate the joy of others too.