My iPhone 5c Hotspot won't work

When I turn on a iPhone Personal Hotspot it forces me off the Internet and makes me use LTE, How do I stop this from happening?

Details:

iPhone 5c (These are no longer offered updates)

iOS 10.3.3 (14G60)

Very good condition

No modifications on the iPhone, Just your average iPhone you would see.

That's how a hotspot works. Let's you connect users to your phone to use its internet connection.

If a Wi-Fi internet connection is available already, then connecting to the phone is unnecessary.