Relax bro - let go of your insecurity, except of course if it drives you to lose weight ...
When a WG sees you, her x-ray eyes see right through you, straight to your wallet - and the fatter it is the wider she smiles
Seriously, a couple of the bros have, let's say, middle-age characteristics. They report being as welcome as anyone.
Conclusion, as long as you can fit through the door, looking like Pavarotti won't affect your punting.
... now, back to your weight. If you DO want to lose weight there's a current thread on the subject. Highly recommended to do, it'll save your life. Or at least make it many years longer. AND it'll add an inch or two to your most important vitalstatistic.
Good luck, enjoy your stay, and look forward to your reports!