Can't improve length for erect penis
So I discovered this site some years ago when I wasn’t completely happy with my penis size as I wanted it to be extraordinary. I gained 2 Cm’s in length for erect penis, grew flaccid by a good bit and even some girth. Then I got exhausted and did not tried again until now. I’ve wanted to grow my penis to about 20 cm when it has an erection, but have not gone past my contemporary 17 cm. I’ve done some jelquing and while my flaccid penis gains have been out worldly, I cannot seem to gain any more centimeters erect. Is there something I’ve been doing that only works for flaccid? Is there any exercise that works exclusively for erect penis?
By the way, I should note that my jelquing exercises have been with a flaccid penis, is that the issue and I should do it with some degree of erection?
Thanks in advance