I am also 5'6". I have a 25" draw.. when I hit full draw 8^) The Hummingbird is a great bow, and that length should be very good for you. Beginners often fall into the trap of thinking that a different bow is going to make them a better archer. As someone who went through some 70 bows in a matter of a few years, let me say that it isn't how well the bow you shoot shoots, it's how well you shoot the bow you shoot. (Love saying that!)
Seriously, a 62" RD is a good length for a short draw person, and should provide (usually) a smoother draw and be a bit more forgiving. I no longer shoot R/D bows, but straight longbows, and my "optimum" length is 66". However, I comfortably shoot bows to 70" and down to 60"... and 60" is a very short straight longbow.
The advantage of shorter is not in accuracy. Generally, most folks will shoot a longer bow better. Most of the great old trad target bows were very long. The short bow is handier for hunting and is a bit faster, all else being equal.
Example: As stated, my optimum or favorite length is 66", but I'm finishing a new hunting bow right now (second coat of TruOil went on this evening). I wanted it for travel, so it's my first take down, and is 61" long. I won't take a shot over 20 yards, so I am not concerned about it's short length. It'll handle well and pack small. That's why I built it. For local 3D shooting, where there are longer shots, I'll stick with my 66" bows.
The bow you have is a good one, and a good size for you to learn form on. Form is more critical on a shorter bow. I'd stick with it.