2004 Honda Accord launching

Hi, my name is Hau and I own a 2004 Honda Accord ex-l v6. I treasure the car with everything i have and once in awhile i did some high speed launch with it, but i think i did it in the wrong way and worried if i've done any damage to the engine, especially the transmission. Here is how i used to launch the car: At red light, my car stopped and i putted the gear all the way down to number 1. I didn't rev the engine or anything, just sit still and when the light turned green, i pushed the pedal hard, all the way down, and the car just rev loud but started very slow. Will this do any harm? Thank you