How do people become a blunt person?

How can I be one? I tend to be afraid to speak the truth and hold my tongue. I envy people than can speak the truth and not be afraid too. People sometimes say I’m too nice to speak the truth and I sugarcoat things to protect someone’s feels and it makes things worse. My best friends get pissed when I try to sugarcoat or lie to protect their feelings. They told me, “Don’t tell us what we WANT to hear. Tell the truth, even if it hurts us. Be DIRECT.”