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Try compassion meditation
It's a great method for loving yourself and for understanding that all people, just like you, want to be happy and want to escape the pain. So it will make you more open to others. If you have hard feelings to someone or even hate them, it will definitely help you.
Here you can read a good and easy description of this method.
If you want someone professional to teach you this method, just find some meditation teachers or groups in your area.