Car accident whos at fault?

I was going through an intersection STRIGHT on GREEN on oppisite side they also had green the far left lane is used for making left turns a big sign is above light that says yeild on green there were 4 teenagers in that car I was halfway through intersection when they turned nothing I could do then the accident accurred I busted my head open needed stitches on forehead so whitch means a scar for life I was rushed 2 hosp n no one question me bout accident I also have a fractured hand n therapy 3-4 times a week 4 my head hand n neck after eveything I found info out the kids lied about who was driving n there trying 2 say it is my fault there defense is they did yeild I was speeding there were no skid marks at scene no tickets were isued I know there kids and kids get B they thought they could beat me either way its messed up in your oppinion do I have a case is it my fault or there's please help