I need help

A little context

So basically I am 12 in year 8 my dad died 4 years ago on the 28th of march so when I was 8 from suicide and  he was an addict , after moving primary's because I was being bullied I met my now current gf , in year 7 I moved high schools from bulling again. Also, I am being bullied at my new school too because I tried to laugh about find some light in a dark situation because as Dumbledore said " light can be found even in the darkest of places" and I found that light through dark humour but ppl had ago at me for it and I feel awful abt it cos now I feel like the bad guy when all I am trying to do is cope with my dad fucking dieing I was posted all over pols snap stories and called a scruff and sick bastard and other shit like that and school are doing shit all about it so I decided to ask strangers for help and I guess you lot are the strangers so thanks for reading and please all I ask for is if there is a way to stop all of this and you I take on this cos I can't take it anymore also there will be mentions of sh and suicide