You can’t use a regular sewing needle for needle felting. Felting needles are specialized tools adapted from those used in industrial felting machines. They are designed to matt and lock fibers together, transforming loose wool batting or roving into felt fabric or sculptural objects.
Can I make a felting needle? - Bear Creek Felting
The one thing nobody teaches about felting needles: placement matters — Stephanie Metz
Dani Ives : Fiber Artist
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Best Needle Felting Starter Kit and Easy Tips for Beginners – Woolbuddy
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A beginner's guide to needle felting – The Crafty Kit Company
Can I Use A Regular Needle For Needle Felting?
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How to felt without a felting needle?