I have a Apple Watch SE 1 and the fall detection feature isnt appearing

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Use Fall Detection with Apple Watch - Apple Support

A SE Series 1 watch does include Fall Detection. Did you go here:

Turn Fall Detection on or off

1. Open the Watch app on your iPhone, then tap the My Watch tab. 
2. Tap Emergency SOS.
3. Turn Fall Detection on or off. If Fall Detection is on, you can select Always on or Only on during workouts. 

If you entered your age when you set up your Apple Watch, or in the Health app, and you’re age 55 and over, this feature turns on automatically. Make sure that your correct age appears in your Medical ID and your Health Profile. Fall Detection is available only for those 18 or older.

Apple Watch cannot detect all falls. Your watch might detect high-impact activity as a fall and trigger Fall Detection.

The Apple Watch SE 1st gen does not include Fall Detection

Apple Watch SE (1st generation) - Technical Specifications