I think I have flat head syndrome. I know that babies can have this and it could be treated but I'm 18. Any suggestion? (photos)

If my skull is too hard to be molded like many babies that have this problem are there any surgeries that could fix this?? I know it's my skull and it could be dangerous but I'm willing to take that risk. My head is completely flat at the back and it goes higher as you can see. This effects my appearance completely. It has made going out of the house a living hell for me since I always get stared at. I'm also thinking about getting fillers in my forehead to kind of even out the slope I have .