It's your decision to make. Why is it that we let people dictate what we do or how we feel about our own bodies? So, we're too fat for most everything, but not fat enough for surgery??? I say screw 'em, lol. If you wait until you are "big" enough for them to think you need surgery, imagine what they would think then...and more importantly, how you would feel about yourself.
You are making a decision to reclaim power over YOUR body, not theirs! Sometimes, we have to be our own cheerleader! And when you're feeling like you can't handle it, imagine those pom=poms cheering YAY just for you!