Evolutionary psychologists say that we develop emotions to keep us safe.
Humans are social creatures, and there are no known societies in the history of the world where being alone was acceptable. We rely on others to live; and to produce food, shelter and clothing for us, keep us company and help us survive. Evolutionary theorists would say, then, that we feel the emotion "aloneness" in order to inspire us find other people when we do end up alone. Being alone means not surviving, and feeling alone prompts us to go and find companionship and other people.
This means you have control of your emotions. You can fix them, and normally you know how. If you feel lonely, you seek someone to be your companion. You feel sad, you seek out something to make you happy. But when it comes to bullying, many of us retract - instead of controlling the emotion of feeling badly about the situation.
But you have a choice.