I masturbate to the pics of dead dolphins

First of all i am not a troll or anything.This is a serious matter!
I started to have this weird "fetish" when we were searching for photos of dead dolphins in the elementary school.I was curious back then so one time we decided to google for the pics of them.I was 10 years old back then,when we found the first results for the dead dolphin photos,my friends disguisted and close the tab but something weird happened to me,instead of feeling disguisted i felt strange it even give me a slight erection.For unknown reasons their forms on the ground were looking so...attractive.Because of this strange urges i am having(i was a kid back then so i thought it was normal also the erection) I decided to stay at school and search for more pictures of them.I made the photos fullscreen and copy-pasted them to my desktop.I thought i was alone at the school and i was stroking my penis while looking at the pictures of those dead dolphins.I was feeling a little bit ashamed though because they were dead and helpless that alone was making me feel so ashamed but i was feeling a pleasure,a strange feeling while doing that,my body was feeling hot.It became a habbit to me after that day.One day when everyone leave the school i decided to stay again just to do the same cycle over and over again but this time my teacher found out about this because i forgot to delete them after i finished my job and she asked "What are these for?" with an angry ashamed face.I couldnt tell her that i have a strange thing for dead dolphins so she thought me sadist at small age and told this to my parents.From that day forward the relationship between me and my parents will never been the same even my brother was avoiding me,i even thought about suicide because somehow my friends found about this too because of that my social life was over.And i am 18 years old now and i am in a new school but i have some friends that are from my old school in the same school as mine and guess what happened? They told that embrassing day to the others.Now everyone is calling me "dolphin-fucker" or "necro negro(even though i am not black) and everyone is avoiding me as usual.What should i do? Because of that damn day,i lost every social interactions in my life.I am feeling so lonely,i always wish that day never happened but i couldnt control my body.Please i need serious suggestions and forgive me for the grammar mistakes etc.
P.S= Also i cant change school because of my family.Is there a way to change schools without the approval of parents?
Thanks for reading.