Hello from Australia.
I had a look at your flat pattern and you've dropped the crotch line down too far.
I'm not sure which size you are working on with that pattern, but for most sizes (say from US 4 - 10) the distance from the waist down to the crotch would be about 27 - 30 cm (that's 10 - 11 inches if you are in the USA).
So move the crotch back up that far and you should be right!
Pretty good effort though, I wouldn't have been able to work that out without having had lessons, so well done.