... you already have a personalized one, you just can't "see" it. And it WILL give away your Gmail address. I use the service Kristan mentioned... but I'd add a caveat.
Nobody knows who they are. You can't even look up the owner of the domain. It's foreign owned. And, of course, they could shut the service down anytime they want. So, you sure don't want to publish that shortened / personalized URL anywhere that it might really matter, in any sort of long-term way.
Here is my Google profile URL which, again, gives away my Gmail address: profiles.google.com/Louis.Foussard
You have one too. :-)