emotional wall; internal barrier
Metaphorical wall that prevents emotional closeness or open communication. Often used in psychological or interpersonal contexts.
She has built an emotional wall and won't easily tell me what she really thinks.
Through counseling, I was gradually able to break down my internal barriers.
Compound of 心 (heart, mind) + の (possessive particle) + 壁 (wall). The metaphorical use of 'wall' for psychological barriers is common across languages.