Hello and welcome to HCM! Your condition is rather common among boys and males: your penis is not straight upon erection but it is rather curved slightly downwards (like the shape of an open umbrella). The most common reason for the downward curving of the penis could be the frequent and aggresive masturbation during asolescence (and later on) by pulling your penis side ways or bending it. The curvature is more probable if you use the same hand and pretty much the same position when masturbating. On the other hand, mainly in the porn movies you see guys with a upwards curved penis (u-shaped penis) and this looks like it is easer for them to have sex in every position. This images increase the anxiety among those that have a curved penis. As a matter of fact, those with u-shaped penis are more comfortable in having sex in positions other then missionary style. But, a non-extremely curved penis can achieve satisfactory sex positions too if the erection function is normal. What to do in these cases? Try to work with your penis (masturbate) using the opposite position of the hand, this should be done over a long period of time. If your penis got curved from a certain position of your hand then changing the position of hand will affect the shape of the penis in the opposite direction. The results will take a long time to appear, though, as they took a long time to curve the penis as well. Remember to not get frustrated by a curved penis! Normal penis is neither perfectly straight and neither U-shaped: it has a slight natural curvature and it is different from man to man. So, keep your seld-esteem high. There is nothing wrong with your penis and the curvature is not a disease, it is rather a condition that sholud not prevent you from the pleasures of sex. Confidence and changing the position of hand when masturbating will make the curvature reduce and make you feel better. Hope it helps, Best!