I've felt more immature than my peers ever since I was eight. And now, after reaching adulthood, it's become more obvious to others as well. I break into tears if someone raises their voice or curses at me, I don't know how to take out my frustrations and end up doing something stupid, I'm extremely dependent on others, I can't handle criticism, and I can't talk through my issues without crying or having a panic attack. Multiple people have now told me they're scared to say anything negative to me because I "won't be able to handle it," and that everyone "walks on eggshells" around me. Is this just a flawed personality trait, or could it be something more serious? I've been trying to improve for years but nothing seems to work.

(Sorry if emotional immaturity isn't what I should be calling it. I don't know what else it could be called.)