31 Years Old - New York, NY

Congratulations, and welcome to the Invisalign community!  You are young, still :D.  Lots of people getting Invisalign around your age.  And many, many people have crowding like yours and even more severe.  You are not alone here!  If you'd like to meet some of our other community members who are working on crowding (though all in different ways), I will give you some names here:

HenryZ (had to have a tooth pulled, he'd nearly done)
Mil ou's crowding is mainly on the bottom and it's pretty moderate, but there is an overlap tooth.
humbleoracle has pretty severe overcrowding in the bottom jaw
knitsew also has an overlapped tooth in her bottom jaw
JLD_Sail also pretty moderate
kellynyc16 is mostly on the bottom
Dante555 has severe overcrowding on the bottom but nearly none on the top
Sunluvva's crowding is pretty severe
and finally, both AreYouKiddingMe and Cazzieboo have very severe overcrowding. mlb502, one of our RealFriends, started with pretty crowded teeth as well, but she's nearly done after a long time.
jbranchfield is our newest community member before you, I think, with significant crowding. 

:D.  I think you'll be waiting at least 6 aligners before you will see any real changes, and likely more like 8.  Crowding cases are difficult because they have to make room in your mouth first, which usually involves moving back teeth.  You may have some very minor movement in the front, since your tooth configuration is unique, but please don't get discouraged if you must wait many trays before you see a difference. :)