I'm so sorry you're going through that. I can imagine it could be debilitating at times and it sounds like you're self conscious about it. It's difficult to say if it's emotional immaturity without knowing more. You mentioned you were an adult, but at 18 that might be more age appropriate. Just as a guess, it does sound like you may be very sensitive to comments or actions by others, which is not necessarily immature in and of itself. Has this issue been improving or getting worse or staying the same over time? You might be headed in the right direction and it could just be a long process.

I think of immaturity more like what I experienced with a friend of mine, whom I've commented about. He is well into his 20's but is entirely dependent upon others for his financial, emotional and physical well being. His manner, behavior, and emotional expression are more appropriate for someone around 14 or 15 years of age. Being around him was like being back in junior high and I half expected him to yank my ponytail as a juvenile way of getting my attention. Being overly sensitive was part of his issue, but it was one of many. His emotional expressions were surely not age appropriate.

It sounds like you want to have more of a sense of "emotional toughness", if I'm using the right term. It's possible that you could benefit from seeing a counselor who could have some ideas about how to improve your sensitivity. I absolutely wish you a good journey in this and hope you find what you seek.