First, and foremost, you have to be yourself.  Although it may seem difficult to you when you first begin this, when you are you and allow others to be them it is the beginning of peace.  Enjoy your spirituality and just being.

you cant change others they need to do it for them selfs

I agree with much of what has been said here. You need to seek the inner, not worry about the outer... I found a page in my journeys about personal peace and growth. The first step applies to your question appropriately, so I will paste it here for your consideration...

Ten Commandments for Peace of Mind

From Shri Gyan Rajhans

How to attain mental peace

Peace of mind is the most sought after 'commodity' in human life. It appears that most of us are in a state of perpetual restlessness. On analyzing the causes of this restlessness, I have ventured to find for myself ten solutions that need to be followed religiously if we are serious about achieving perfect peace of mind.

1. Do not interfere in others' business

Most of us create our own problems by interfering too often in others' affairs. We do so because somehow we have convinced ourselves that our way is the best way, our logic is the perfect logic, and those who do not conform to our thinking must be criticized and steered to the right direction, our direction.

This kind of attitude on our part denies the existence of individuality and consequently the existence of YHWH, for YHWH has created each one of us in a unique way. No two human beings can think or act in exactly the same way. All men or women act the way they do because they are prompted to do so by the Divine within them. There is YHWH to look after everything. Why are you bothered? Mind your own business and you will have your peace.

Seek With!
Mystic

I am sure that nobody can change other's when they are 15 years or older. If you can't understand why other are what they are and you don't like their behavior the only way which works for me is to change my attitude or if it doesn't fit my world vision i just don't communicate with the people which hurts me. But i know one thing surely  you can not change others and you don't need to try or think maybe later he or she changes...