Why are you shortening my name?

I don't know you; you don't know me. We recently met; yet you feel the need to shorten my name. Why? I let friends call me Steph, and my family enjoy the small privilege of crazifiing my name to a semi short word that resembles a version of Steph. I attribute this strangeness to growing up as children and unable to actually verbalize my name correctly. But seriously--people I have just met? The implied intimacy is there--but it isn't--because...we just met. A friend attributes this phenomena to a control issue on their part. I think they don't know what they are doing. I also think they do it to everyone. Usually I feel shocked and confused. Next time, I will summon the courage to mumble "Stephanie" and hope they catch it. Next time.