Is there something wrong with me?

Hi I am a you preteen and I have asthma. I also get sick very often but my sister does not and she has a strong immune system. I don't no about me. I got shingles at the age of 7 but not a bad case. It has scarred my back. It recently came back and I no have it, instead of 1 place, 3 places. It is still hee and I don't know what to do. My mother might put me on antiviral but she hasn't yet. Right now all we're ding is putting something on it. What is wrong with me?