Cute shirts and i feel your pain because being super pale i have also had my fair share of sun burn too
Something that always works for me to soothe the pain is porridge oats/oatmeal.
Get a wash cloth, handful of oatmeal and a elastic band place the handful of oatmeal in the center of the wash cloth then gather up all the edges and tie with the elastic band.
You run your bath water through the wash cloth full of oatmeal and it turns the water cloudy, something in the oatmeal soothes the sunburn.
I know it sounds weird but it really works, hope you feel better soon