Can i file this years taxes even if i did not work in 2018?

Yes, just enter a 0 (zero) for the 2018 AGI

If you had taxable income for 2019 you can file a 2019 tax return.  When it asks you for a 2018 AGI, use zero.  If zero will not work and let you e-file, then you have to print, sign and mail your 2019 return.