Too short for 24"?

I suggest riding a 20" wheel for a season and see if that "small" feeling goes away. 20" wheel is much easier to jump/trick with than a 24" wheel. I feel this way: You ride a 20" bike, a 24" bike rides you.

You can do any trick on a 24" bike, as long as you commit to it. If you have the physical strength, and the will to do it, you can do it. Since it's a bigger bike of course, it won't be as easy as a 20", but that's common sense of course. And 5'7 isn't that short anyways. Just commit to it, and you can do it.

I'd recommend 20" from personal experience. Never been much of an mtber but I rode a 24" street mtb for about a year (a good custom build, not a moody cheap off the shelf "jump bike"). It was fun but was my first bike after not riding for a few years. Then I went back to 20" and it feels so much better. I'm 6' and 34 years old, so the thought of other wheel sizes has been through my head many times. It just doesn't feel right to me though.
The other option would be 22" as they're becoming fairly popular now, and s&m make a 22" atf. They have a much closer feel to 20", but with added stability (from what I've heard anyway. Quite a few people have said it's the perfect size and they wouldn't go back to 20")

Keep in mind it's hard to find a good selection of rims, tires, and forks for 22" and 24" bikes. I agree with Steve. I rode my cruiser for 2015 and just build a 20" for 2016. The minute I hopped on that I instantly felt like I was riding a bmx bike. It's way more nimble, which for me means more fun in the air, and easier to throw when bailing too.

And according to Google, the average male height in the US is 5' 10". Vertically challenges in my definition would be more like 4' 11".

Ryan Nyquist is like 5' 6" and kills it. He has even been riding a 26" dirt jumper lately.

It's technique and some strength too. If you can hop bar a 20" you can probably hop bar a 24" with a few attempts.