On Saturday to parkrun I wore shorts as it was going to be warm. No one threw up, commented, laughed or expired at the sight of my not pretty white legs. In the past I was worried what people would think. My first C25k runs were on back roads in the dark to avoid people seeing me. I wore black leggings and dull t shirts. Now, while not exactly confident, I realise no one could care less!
For anyone concerned what they look like: too fat, too old, too slow, too red in the face, do not worry. As many have said here before, the fact that you're out there trying to improve your health and fitness is reason enough to be proud not embarrassed. In the words of the adverts: Just Do It!