Hi:
Your PC does not have a secure boot setting because it was released to market before Windows 8 came out.
Only PC's that came with Windows 8 or have a Windows 8 or newer product key in the BIOS have a secure boot setting.
Your PC can't run W11 for two other reasons...
It does not have an Intel 8th gen core processor (the current minimum supported processor).
It does not have TPM version 2.0.
The TPM your PC has is 1.2 and cannot be updated.
See the W11 system requirements at the link below...
Windows 11 requirements - What's new in Windows | Microsoft Docs