Briar, I'm a dating coach and I actually just published a book a few days ago about the best possible way to find success on Plenty of Fish!! So good news, I've got the answer for you...
NOTHING TO DO WITH HEIGHT. The issue is that you're taking it seriously. I can absolutely guarantee that it's the issue because I'm also a dating coach and I've seen guys fail on this hundreds of times in a row. As soon as they start using my tips, they start having success.
Women will tell you to be yourself, but these aren't the kind of men they're attracted to. If they were, you'd be on a date right now and not reading my response to your question.
1) You need to be interesting, smart, funny, and most of all mysterious. If a woman reads your profile and learns everything about you, she won't have any questions for you. A woman needs to read your profile and think internally "Wow, very interesting. Who IS this guy? I've got to send him a message and ask a few questions." (This is a rare occasion though. YOU will be initiating most of the communication. See #3)
2) Your pictures need to be unbelievable. No matter how many times our teachers tell us not to judge a book by its cover, we do it constantly and habitually. Why? Because it might not be fair but it's the quickest way to understand what you're looking at. Go through your hundreds of photos, find the best 30 pictures and ask female friends to narrow down the top 3 or 4. Use these pictures even if YOU don't like them.
3) Tease women. They love it. They're addicted to it. Message a girl and say "wow nice pics. did a monkey take them?" or "god your so cute, i wish you were my type." If they ask what you meant by that, the best response is always "i dunno [and jump into a new topic]" It's mysterious and they love it.
When it comes time to start dating any of these women in person, you're still going to be yourself - and they'll love you. But you've gotta get them interested first. Think of your profile like an awesome TV commercial for a food that nobody would EVER consider tasting until the commercial got them interested. Anyway these tips have barely scratched the surface but should get you heading in the right direction!