I'm 5'8-9 and 140 pounds, and I have bought Bentchetlers but not ridden them yet. I know people who are smaller that have ridden them. If you are growing and planning to keep them a few seasons you could certainly manage them but I'd guess something a little smaller and a little narrower would be more fun for this season.
there's a certain point where it neither looks good nor functions properly...that's when you know you look steezy - no_steeze
R.I.P CR & Arne