Poor girl, you said that you really dont want to practice your roll, and thats all people are telling you to do! And Im going to join them! Id guess the GT is fine for your stage, unless its simply uncomfortable physically to be in or you just really want a new boat. Ive taught a lot of folks in the GT. If you really want a very easy boat to roll you might try a small creeker or something similar (think no edges) perhaps try to borrow one from a friend.
Ill disagree a bit with all of the suggestions to go to the playpark. It can be intimidating to be windowshaded in a hole (and not 100% safe, you can smack your head/paddle in shallow ledges), the water is usually damned cold or dirty (eg, confluence), and of course, it is moving so it takes lots more energy to swim). Id strongly second the suggestion to go to the pool this spring, or to a lake this summer. I spent my whole 2nd summer going to the lake in my town and trying trying and trying again on my roll. It was hot out, swimming in the lake felt nice, and it didnt take as much energy to get to shore. Plus it gave the sunbathers something to laugh at.
The EJ video might work, or perhaps try to find a good instructor. Mentally be willing to start with a clean slate and maybe you can get out of whatever bad habits your in (in all likelihood, raising your head). Take a step back and it may allow two steps forward. This approach worked for me with both a bad kayak roll and an ugly telemark turn!
One last thing, when I was struggling with my roll, some helpful friends assigned me the task of learning my handroll on both sides over the winter. I did that, and the next summer my combat roll was just about perfect. I taught rolling for a few years and always told my students their pool syllabus was: onside paddle, offiside paddle, onside hand, offiside hand roll.
Good luck with both the roll and the boat