Why is helping others a good way to heal from a breakup, and how can it actually make you feel better?

Have you ever had a person yell at you or call you selfish? How did you feel?
Why is it so hard to find a girlfriend? I’m 21, but I am very responsible and loyal for my age. I am way too lonely. What can I do?
What strategies can you use to offer help in a way that encourages the other person to take responsibility?
What steps can introverted individuals take to improve their prospects of finding a compatible partner in a culturally challenging environment?