Did my mental illness turn to something else ?

Wow...I understand you completely, and I am also 20. I know it feels silly to feel this way when you're an adult, trust me. I'm so scared people are carrying handguns and that my parents will die and all this other stuff. It may not be that your mental illness is something ELSE, but it may have worsened. Some mental illnesses get worse the older you get. This may be helped with OCD meds, anxiety meds, or even antidepressants. It doesn't mean you're crazy or a paranoid schizophrenic. As most people will say, I'm sure, see your doctor. If it's an emergency, go to the ER and they'll admit you into a behavioral health unit, get you on meds, and get you a psychiatrist (this is all if you don't have one right now).