My parents are disabled how am I supposed to get a healthcare plan?

My parents are disabled and receive social security. They have Medicare. I am a 20 year old who lives with my parents and I attend community college. I currently do not have healthcare and I am wondering where this puts me. From my understanding I cannot be put on the Medicare plan (because I am 20 and Medicare is for the elderly/disabled). I go to school and I also work part time, but my part time job would not be nearly enough to pay for a healthcare plan (from some of the prices of the plans I have seen) I am worried about this. Any thoughts/suggestions would help!