Yes, you can. But, the court will likely look into the fact that you weren’t wearing a helmet and they will instruct the jury that the jury can consider that as comparative fault. Meaning that, if you don’t have a helmet on and it makes your injuries worse than they would have otherwise been, the jury can look into that to determine whether your conduct partially caused your injuries.
That is still up for debate somewhat within the courts, though, because the motorcycle helmet law has changed and your attorney should argue that the jury should not be able to take into account that you did not wear a helmet, as long as you’re 21 years of age. But, on the other hand, the defense will argue that it should be taken into account when determining whether you were comparatively at fault for your own injuries.