I get horny from embarressment and humiliation from me and others

I went to a private Highschool with uniforms and strict teachers.The students were pretty normal though mabir even worse then the public schools,Anyway this one time i didnt want to wear panties and my skirt was kinda short on me I was a little late for class and was walking up the stairs and noticed 2 boys probably 12th grade walking up the stairs behind me I got really sexually aroused from thinking of the fact of them maybe seeing my bare pussy I got easily wet too, I even slightly bent over so they may see it.I had to hold my breathe incase some weird noise might of came out..They walked right by not noticing me. after they completly left I ran to the bathroom to masturbate. Another time in class this boy had his pants stuck on the side of a shelf which had a nail sticking out he didnt notice and i suppose when he moved his pants ripped showing part of his boxers,He screamed,whole classed laugh,I got turned on and wet again not wearing panties,We also had a test that day,during it i mastrubated slightly and tried not to make to much noise.I couldn't help but think of everyone hearing me and looking at me it turned me on so much good thing i stopped before i came. Is this normal? And is it a fetish or somthing, Is there a name for somone like me?