I’m a little lighter, and people are always amazed at how much I cycle (not a lot compared with peers) but often tell people I’m fit, not healthy. Only cycling can have downsides and I’m working on some issues to be both fit and healthy.
While I was once 78kg through lifting, I’m close to my ‘off the couch’ weight now, so rarely get comments, except from my rugby loving dad. They are of little concern, especially when riding in the Alps. 
And this is the key part, you are both light but also cross-training and not just cycling. Balance is part of being healthy and while you may have less mass, are still strong.