I'm only slightly overweight and hike a lot. I'm 43 and not known as a snorer. Got my CPAP a few weeks ago. Snoring isn't always obvious and doesn't require being fat.

If you wake up tired and have low energy with daytime sleepiness try getting checked for sleep apnea. The home test is pretty easy (pulse oximeter followed by a slightly more involved test with a chest strap and a cannula).