Your penis is ideally normal in size. However stop masturbation
because excessiveness of anything is not good. You had started masturbation in very little age, so you are feeling yourself psychologically upset, while physically you are quite fit.
You have no problem of testicles. In male it is most common for one testicle to hang lower than the other. It is estimated that in about sixty five percent of men the lower hanging testicle is the left one. This is due to differences in the vascular anatomical structure on the right and left sides.
Include fresh fruits, vegetables, eggs, honey, milk, butter, almonds and pine nuts in your daily diet for strong sexuality. Never smoke and keep yourself away from alcohol.