What was the shape of "it"?
Well, by "my old man" I meant, figuratively speaking, the person I was before God gave me newly born spiritual person inside this old body after I learned to put all my trust in Jesus and His way of doing things. Briefly:
"Knowing this, that our old man is crucfied with him, that the body of sin might be destroyed, that henceforth we should not serve sin" (Rom. 6:6).
(If you were inferring that "my old man" was a euphemism for my father--no, the cross spoken of was not a three-seater!)
But if you meant whether the Cross was of the stipes/patibulum style, or was a T-bar (where did Pilate's Iesu Nazareni Rex Ioudaeorum in Latin, Koine, and Hebrew/Aramaic go?), or shaped like an X (Roman 10th Legion was quartered around Jerusalem), or if it was just a tall stake without a crossbar that was used for Jesus' crucifixion--ah, well, I don't know for sure. I just picture it as a Roman-type cross. The Bible doesn't tell us. It only calls it a σταυρος (stauros - stake) or ξυλον (gzoolon = of wood, beam use to hang one) (Acts 5:30. 10:39).
(The JWs want you to believe it was just an upright stake, as if that made any difference.) The Roman torture cross apparently is well-established in history from 600 BC to 400 AD, and is probably the right one, but we really do not know, AFIK.