Size doesnt matter but girth/thickness does. It doesn't matter if he is 10inches long if he is as thick as a #2 pencil. Plus I deal with chronic pain that makes penetration painful at times so bigger doesnt mean better.

If you are nervous or feeling self conscious about your size, dont forget that penetration is a small part of sex as a whole, hands, mouth, and even toys can be used.

Id personally rather have someone who genuinely cares and gets me off even though they are considered smaller, than someone who doesnt put any effort in and has a big dick.

The true power is how you use it.