Hello there!
This is an interesting thing I did last year in my Sophomore year.
Let me try this out!
First, we wanna start by drawing a standard structure with carbon in the middle, as hydrogen can only form one bond. (Please see pictue #1)
We know that the center carbon has too many bonds (maximum of 4), so we will shift two hydrogen over to the other carbon. (See picture #2)
Now each carbon has too few bonds, so we will make a double bond between them.
The last picture is the correct structure of C2H4, ethylene. The octet rule is kept.
I am terrible when it comes to drawing things. I hope this helps~!