I totally agree with the other two: These things take time, and you will progress at your pace, and no one else's!
I've been poling for 6 years, but due to a lack of social encouragement (particularly from my ex), a lack of confidence (as in, I didn't think I could really make any progress) and just general laziness (I preferred the comfort of the couch or my bed to the discomfort of getting used to a pole sit), I haven't made much progress at all. I did, however, learn a LOT about my mind and body!
My "resting weight," when I'm not working out or running, is between 165 and 175 lbs, and I'm 5' 7". My current weight, since starting running last year and getting into pole properly about six months ago, is now 200lbs. I haven't gained any size- in fact, I'd say I'm losing some! I am, however, a lot stronger and more "dense" than I used to be. I got muscle, and I'm super happy with that ;)
So, don't worry about your weight, don't worry about how fast or slow you progress! After six years and barely being able to do a basic invert by the end of that time, I know that some people just take time.
And, I bet you anything you'll take a lot shorter time than that to achieve a lofty goal like a basic invert! Even if it takes you a year, you'll be about six times quicker than me ;) haha