Never worry about what other people say. Never worry about what other people think. Never worry about how fast you're going. Never worry about how far you're going. Just keep going.

Look at it this way:
You're on a bike! You're actually ___________ (exercising, helping the environment, modeling a healthier life for your kids - you fill in the blank)! Most of the people who say things are too lazy to get out of their cars and actually pedal somewhere. No matter how slow anyone is, and even if you're only biking 3 miles, you're doing better than 75% of the people in this country. Nothing makes me happier than to see Clydes, 80 year old women, families, on bikes. Good for all of them!