Quite a few people (22%) who stutter also develop some form of social anxiety during their adolescence. Which generally means: Low confidence, below average social skills, low socioeconomic status. If you can overcome these obstacles, great! Then relationships, friendships or love aren't that big of a deal. But some people are more affected and thus are perceived as unattractive. What I mean to say is that "Just be confident" doesn't always work, especially if you're more sensitive to the disadvantages that speech impediments bring along. Not being able to express yourself is one of the most disabling things I've encountered so far. Someone in a wheelchair, as hard as it might sound, is probably unattractive to 95% of the dating pool simply due to a physical disability. Personality etc. of course matters but people subconsciously will wish you good luck, say you're amazing but then refuse with "someone else (not me)" is going to find you attractive. It's interesting how our morals tell us that we shouldn't base love on superficial things, but on a deeper, biologically-oriented level, we indeed do care very much about attractiveness in terms of genetic quality, i.e. intelligence, looks (symmetry, prominent features), illnesses/disabilities (physical or mental), how someone is perceived by the general population or by your closer environment (friends, family)