hermit-IX have you asked these people what they mean by "witch"?
What is their definition? (it can mean many things to many people).
Perhaps you have a direct way of speaking that gets right to the point of things that makes them uncomfortable? Perhaps you say "Oh I wonder if if X is coming home today..." - and then X knocks on your door?
Perhaps you are extremely astute and able to figure out what people might be thinking?
Do you wear swishy ethereal looking clothes and float about with a black cat by your ankles?

Do you love the night and have a fascination for the Moon?
Can you hear the Wild Call You - especially on Moonlit nights?
I am a Witch. And a Wiccan:
Definitions from The White Goddess - Pagan Portal:
"Witch
A practitioner of folk magick, particularly that kind relating to herbs, stones, colors, wells, rivers, etc. It is used by some Wiccans to describe themselves. A Witch is someone who practices the Art of Witchcraft, and who uses her will to bend or shape the reality around her. Witchcraft focuses on using Magick and ritual to work with the elemental and spiritual forces in nature. As with most things witches come in lots of different flavours there are traditional witches, green witches, hedgewitches, and hereditary witches who claim direct lineage with parents/grand parents etc, these usually operate as small independent family groups."
"A definition of Wicca or a Wiccan may be;
A modern Pagan religion with spiritual roots in the earliest expressions of reverence for nature. Some major identifying motifs are: reverence for both the Goddess and God; acceptance of reincarnation and magick; ritual observance of astronomical and agricultural phenomena; and the use of magickal circles for ritual purposes. A Wiccan may practice witchcraft or so therefore could call themselves a witch. This doesn't apply to all Wiccans neither does in imply that all witches are Wiccans".
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A "Water Witch" - is a water dowser. Some dowsers can dowse for anything.
I remember watching one on TV once, who's speciality was finding diamonds in South Africa.
"The Witch - is the ultimate feminist icon, fierce, independent and powerful with an identity not tied to a family or a man...one of the oldest female archetypes" - Timeline.