i am unable to find personal hotspot option in my iPhone SE

See this Apple article: How to set up a Personal Hotspot on your iPhone or iPad

https://support.apple.com/en-us/HT204023

Call your carrier or stop by and ask them to make sure that you can use Personal Hotspot with your plan.

Personal Hotspot is a specific cellular carrier service.

Contact your carrier and ask them

Regards

Giulio