While personalities vary and some people are potentially born more sensitive than others, there are other factors that can contribute to a person’s sensitivity level. Those factors include both life experiences and a person’s environment. Think about it, if someone grows up living in a bubble where they are never given consequences for their behaviors or told that they are great at everything with minimal effort–then any little insult or negative comment is going to hurt them because they were never exposed to adversity or hardships. On the other hand, if you have someone who has experienced more rejections in life or had a tougher living situation, this person is going to have a thicker skin and become mentally stronger over time. Maybe initially, they might feel weak, hurt, and extra sensitive but they tend to overcome these negative feelings because they are forced to cope and persevere.
Remember that it is always much more rewarding to have to work harder at things, to experience failures, to not be living a cushy life where everything is handed to you, and to embrace any challenges that come along the way because you are developing a stronger mindset and therefore will not take things as personally. It is okay to feel sensitive from time to time but ultimately, it is best to know how to adapt and learn how to regulate your emotions. The ability to self monitor your emotions is a life skill that needs to be developed and ideally it is something that should be taught as early as early childhood. Keep in mind that this is a skill that can improve throughout the course of your lifetime and it is never too late to consciously make the effort to become more mentally tough.