Why is my iPhone battery health running down too fast??😔

You have not said what your Battery Helth reading is, but it is an inexact figure that varies with usage. All batteries deplete with age. You need not worry until Battery Health reaches 80%, at which time you will need to make an appointment at the nearest Apple Store for a Battery Replacement.

Would you please say how long you have had the phone, and what “too fast” is?

I don’t have an important

My battery on my I Phone 8 runs down after about 12 hours. I do not download or stream. Mostly IM and e-mail. Is the battery going bad or do I have to many apps?

What do you see when you go to Settings/Battery/Battery Health?