You grew up thinking the world revolves around you as a child. As you get older and experience more rejections and harshness, you realize the world doesnt give a **** about you. This will help you harden up.
This is common amongst mamma's boys. I grew up as a daddy's boy so I naturally didn't give a sh1t and always competed for dominance. And women were just the spoils of victory. If you still live with your mom, or still have ties to her, kill your inner boy. You might be carrying around cuck programming without even realizing it.
You are asking the wrong question. You should ask "how do I get tougher" If you try to eliminate a negative, you won't get to where you want to go.