Yesterday I started masturbating and my penis why dry and the skin started to come off. Then at night I masturbated one more time and when I started doing it I realized that my penis is burning and is sore. I have had no sex in my life so I doubt it can be STI. Today I took a shower and the burning sensation and lessened today but it was still red and tender and it hurt when I touch it. I am pretty worried about this. Can it be dry masturbation?