The definition of Serenity is "the state of being calm, peaceful and untroubled."
I cannot change how others treat me. I cannot change how other people feel about me or what their opinion of me is. I cannot change their actions, motives, thoughts, feelings, measures of success or how they define love.
I can change how I react. I can change how I feel about others and how I treat others. I can change how I treat myself and how I show love. I can change my motives and thoughts which will change my feelings. I can change my opinion. I can change my words.
Wisdom will come. Don't react, wait for the wisdom.