If I have never filed taxes but have had multiple jobs, should I file,? And if so will I get in trouble?, Also will it stop me from getting a stimulus check l?

If you receive Social Security benefits, see this US Treasury website - https://home.treasury.gov/news/press-releases/sm967

regarding previous years, and this year as well, see IRS Pub 501 for who  must file based on your income and circumstances.