You know, you could consider getting therapy. Being sensitive to criticisms often results from something deeper, such as insecurity or some kind of vulnerability. There are lots of different therapeutic modalities, but CBT may work well, since you can look into the roots of this mindfully, and develop meaningful changes. The outcomes can be more than better coping or masking.
I’m going to go out on a limb for the next two suggestions, particularly the second one.
Psychedelics with a strong therapeutic intent, can not only help loosen the psychological armoring we create to shield us from vulnerability, but also help make changes when belief structures can be cleaned up and changes. You would want to work with people who do this way (instead of partying with it), or with therapists that administers this with a clinical protocol. These should include integration sessions to help bring the insights and changes to your daily life.
There is also the option of working with acupressure or acupuncture, with the caveat that most licensed acupuncturists do not know how to work with this. They usually take a holistic approach and stick to what are called the twelve ordinary meridians. If the roots of sensitivity to criticisms is in your physical health, this may catch it. Holistic treatment though, means the provider won’t specifically target what you came in asking help for.
If you are lucky and find a provider that works with the eight extraordinary meridians, there are two specifically related to sensitivity to criticisms. These are the yin and yang qiao mai, with the yin qiao mai directly expressing your consciousness’s ability to receive criticism, as well as insecurity, vulnerability, etc. Yang qiao mai expresses your ability to give others criticism without being a jerk.
It’s not as if using these methods are like using a magic pill. However, they can greatly accelerate whatever therapy you are working with.