Have you ever experienced any form of pain while doing your routines?
If so, you might have damaged the smooth muscle fibers and the damage might have left a scar in the tissue, creating a micro-scar. Now, the scar tissue is not as elastic as other tissues in your dick, pulling it, when become erect, into a certain direction, since it won’t stretch at all or only up to a insignificantly amount.
Most of the body of the penis consists of three masses of erectile tissue. Erectile tissue contains a maze of vascular channels separated by partitions of connective tissue and smooth muscle fibers. Two of the erectile tissue masses are called the corpora cavernosae. The third mass is called the corpus spongosium.
I don’t want to freak you out since it’s just one of a few possibilities, but it can only be corrected by surgery, even though there were reports from members of the PE neighborhood where appearantly jelquing did the trick for them.
You might want to plan a trip to your doctor and have it checked out.