Just about every man - regardless of the actual size of his penis - worries about being too small. In fact, according to a 2008 study in the Journal of Health Psychology, men list the size of their penises among their top body concerns along with height and weight.
Some men experience extreme self-consciousness regarding their penis size, fretting that others will be able to see the size or shape of their penis even when they have trousers on. Wylie and Eardley (2007) call this excessive concern 'small penis syndrome'.
A man might not actually have a small or short penis, but that doesn’t mean this psychological condition can’t have an impact for him physically. For example, men who think they have a small penis might be less likely to visit sexual health clinics for check-ups.
Most men find the combination of sex education with standard penile measurements helpful and relieving. This combination can correct any previous sexual misconceptions, relieve unnecessary anxiety concerning penile size, and decrease the desire to undertake still-to-be verified lengthening procedures (Shamloul, 2005).
While reassurance about average sizes is often comforting for most men, for some men who are very anxious, it doesn’t make any difference to them because they feel that they are inferior. It's an emotional feeling of penis shame and can sometimes be a symptom of an underlying anxiety problem.
If you find yourself worrying about your penis size on a daily basis, or if the intensity of your anxiety seems excessive, you may want to focus on daily anxiety management. Mindfulness practices such as meditation and breathing exercises can help to reduce your anxiety.
Additionally, you may want to try minimizing your anxiety triggers. For example, watching mainstream porn can expose you to skewed representations of penis size. So watching less mainstream porn or watching porn with more diversity can be helpful.