Hello I have been a permanent resident since the age of 8 I am now 21 years old and my green card expired exactly a year ago. I didn't renew it because I did not have the money to. I'm going to file my I-90 form online today will I have any problem renewing it?

All good, your permanent residence is permanent. It is the card that expires. Are your parents USC's? If they natzed earlier and meet some physical presence requirements, you may be a US citizen. I would recommend you consult with an experienced immigration attorney. But still file the I-90, don't wait. Good luck.