Do I have to file taxes if I made less than 10k in 2019? I live in California

You should file to get earned income credit for both federal ad California returns if you have earned income.  

you are required to file if oy have self-employment income of more than $400.  your return is now late. it was due 7/15 as were any taxes due.  

Did you have a job that provided you with a W-2?  Were taxes withheld from your paychecks?  If so you would want to file in order to seek a tax refund.  And you might meet the criteria to get earned income credit.

If your earnings were from work as an independent contractor, you are required to file if you made over $400.

Who has to file?

http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F