That depends on who is asking! Seriously - if you're bothered about measuring up in communal showers, then maybe you have an issue, but if, as I suspect, you mean in terms of sexual activity, the answer is probably no. Women consider sexual satisfaction in lots of different ways - gentleness, consideration, willingness to follow non-verbal signals, the list goes on, but the myth about penis size is perpetuated by men, not by women. Your partner will appreciate you for the reasons above, plus plenty of others, and if she compares you to past partners, and advises you that you don't measure up, look for someone else!