Hi IMJ,
You know the original saying "God, grant me the serenity to accept the things I cannot change; courage to change the things I can and wisdom to know the difference".
I have come across a very interesting altered flavour to this which is as follows: "God, grant to serenity to accept the people I cannot change; courage to change the people I can and wisdom to know that the 'only people' I can change is "ME".
Obviously, I am not suggesting that you must change yourself to be like your other friends / acquaintances, but you CAN change your outlook, expectations, attitude and views on things & people. YOU can decide that you will live life by your standards and you will NOT let others or others' ways of life to take control of your life.
Remember, NOBODY except YOU can actually control your happiness, your mood, your well-being and even your financial goals.
More power to you.
Chin up!